[ { "id": "https://authors.library.caltech.edu/records/rmcb4-rwb54", "eprint_id": 16778, "eprint_status": "archive", "datestamp": "2023-08-21 22:26:46", "lastmod": "2023-10-19 22:33:04", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Long-D-A", "name": { "family": "Long", "given": "D. A." } }, { "id": "Havey-D-K", "name": { "family": "Havey", "given": "D. K." } }, { "id": "Okumura-M", "name": { "family": "Okumura", "given": "M." }, "orcid": "0000-0001-6874-1137" }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "H. M." } }, { "id": "Miller-C-E", "name": { "family": "Miller", "given": "C. E." }, "orcid": "0000-0002-9380-4838" }, { "id": "Hodges-J-T", "name": { "family": "Hodges", "given": "J. T." } } ] }, "title": "Laboratory measurements and theoretical calculations of O_2 A band electric quadrupole transitions", "ispublished": "pub", "full_text_status": "public", "keywords": "absorption coefficients; electric moments; infrared spectra; molecular electronic states; oxygen; quadrupole moments; spectral line intensity", "note": "\u00a9 2009 The American Physical Society.\nReceived 15 July 2009; published 21 October 2009.\nThe research at the Jet Propulsion Laboratory JPL, California\nInstitute of Technology, was performed under contract\nwith the National Aeronautics and Space Administration.\n\n
Published - Long2009p6351Phys_Rev_A.pdf
", "abstract": "Frequency-stabilized cavity ring-down spectroscopy was utilized to measure electric quadrupole transitions within the ^(16)O_2 A band, b^1\u03a3^+_g \u2190 X^3\u03a3^-_g(0,0). We report quantitative measurements (relative uncertainties in intensity measurements from 4.4% to 11%) of nine ultraweak transitions in the ^NO, ^PO, ^RS, and ^TS branches with line intensities ranging from 3\u00d710^(\u221230) to 2\u00d710^(\u221229) cm molec.^(\u22121). A thorough discussion of relevant noise sources and uncertainties in this experiment and other cw-cavity ring-down spectrometers is given. For short-term averaging (t<100 s), we estimate a noise-equivalent absorption of 2.5\u00d710^(\u221210) cm^(\u22121) Hz^(\u22121/2). The detection limit was reduced further by co-adding up to 100 spectra to yield a minimum detectable absorption coefficient equal to 1.8\u00d710^(\u221211) cm^(\u22121), corresponding to a line intensity of ~2.5\u00d710^(\u221231) cm molec.^(\u22121). We discuss calculations of electric quadrupole line positions based on a simultaneous fit of the ground and upper electronic state energies which have uncertainties <3 MHz, and we present calculations of electric quadrupole matrix elements and line intensities. The electric quadrupole line intensity calculations and measurements agreed on average to 5%, which is comparable to our average experimental uncertainty. The calculated electric quadrupole band intensity was 1.8(1)\u00d710^(\u221227) cm molec.\u22121 which is equal to only ~8\u00d710^(\u22126) of the magnetic dipole band intensity.", "date": "2009-10", "date_type": "published", "publication": "Physical Review A", "volume": "80", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 042513", "id_number": "CaltechAUTHORS:20091120-133532823", "issn": "1050-2947", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20091120-133532823", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA/JPL/Caltech" } ] }, "doi": "10.1103/PhysRevA.80.042513", "primary_object": { "basename": "Long2009p6351Phys_Rev_A.pdf", "url": "https://authors.library.caltech.edu/records/rmcb4-rwb54/files/Long2009p6351Phys_Rev_A.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Long, D. A.; Havey, D. K.; et el." }, { "id": "https://authors.library.caltech.edu/records/xzqbn-53m36", "eprint_id": 12764, "eprint_status": "archive", "datestamp": "2023-08-22 13:37:38", "lastmod": "2023-10-17 20:54:32", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wang-Shuhui", "name": { "family": "Wang", "given": "Shuhui" } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } }, { "id": "Pongetti-T-J", "name": { "family": "Pongetti", "given": "Thomas J." }, "orcid": "0000-0001-9465-0853" }, { "id": "Cheung-Ross", "name": { "family": "Cheung", "given": "Ross" } }, { "id": "Yung-Y-L", "name": { "family": "Yung", "given": "Yuk L." }, "orcid": "0000-0002-4263-2562" }, { "id": "Shim-Changsub", "name": { "family": "Shim", "given": "Changsub" } }, { "id": "Li-Qinbi", "name": { "family": "Li", "given": "Qinbi" } }, { "id": "Canty-T", "name": { "family": "Canty", "given": "Timothy" } }, { "id": "Salawitch-R-J", "name": { "family": "Salawitch", "given": "Ross J." } }, { "id": "Jucks-K-W", "name": { "family": "Jucks", "given": "Kenneth W." } }, { "id": "Drouin-B-J", "name": { "family": "Drouin", "given": "Brian" } }, { "id": "Sander-S-P", "name": { "family": "Sander", "given": "Stanley P." }, "orcid": "0000-0003-1424-3620" } ] }, "title": "Validation of Aura Microwave Limb Sounder OH measurements with Fourier Transform Ultra-Violet Spectrometer total OH column measurements at Table Mountain, California", "ispublished": "pub", "full_text_status": "public", "keywords": "OH total column, Aura MLS, FTUVS", "note": "\u00a9 2008. American Geophysical Union. \n\nReceived 29 January 2008; accepted 26 August 2008; published 19 November 2008. \n\nWe acknowledge the support of the NASA Upper Atmosphere Research, Aura Validation, Solar Occultation Satellite Science, and Tropospheric Chemistry Programs, the NASA Undergraduate Student Research Program (USRP) and the Caltech Summer Undergraduate Research Fellowship (SURF) program. We also wish to thank King Fai Li and Run-Lie Shia (Caltech) for helpful discussions. Alyn Lambert (JPL) is kindly acknowledged for helping with the orthogonal linear fit. Work at the Jet Propulsion Laboratory, California Institute of Technology, is under contract to the National Aeronautics and Space Administration.\n\nPublished - WANjgrd08.pdf
", "abstract": "The first seasonal and interannual validation of OH measurements from the Aura Microwave Limb Sounder (MLS) has been conducted using ground-based OH column measurements from the Fourier Transform Ultra-Violet Spectrometer (FTUVS) over the Jet Propulsion Laboratory's Table Mountain Facility (TMF) during 2004\u20132007. To compare with FTUVS total column measurements, MLS OH vertical profiles over TMF are integrated to obtain partial OH columns above 21.5 hPa, which covers nearly 90% of the total column. The tropospheric OH and the lower stratopheric OH not measured by MLS are estimated using GEOS (Goddard Earth Observing System)-Chem and a Harvard 2-D model implemented within GEOS-Chem, respectively. A number of field observations and calculations from a photochemical box model are compared to OH profiles from these models to estimate the variability in the lower atmospheric OH and thus the uncertainty in the combined total OH columns from MLS and models. In general, the combined total OH columns agree extremely well with TMF total OH columns, especially during seasons with high OH. In winter with low OH, the combined columns are often higher than TMF measurements. A slightly weaker seasonal variation is observed by MLS relative to TMF. OH columns from TMF and the combined total columns from MLS and models are highly correlated, resulting in a mean slope of 0.969 with a statistically insignificant intercept. This study therefore suggests that column abundances derived from MLS vertical profiles have been validated to within the mutual systematic uncertainties of the MLS and FTUVS measurements.", "date": "2008-11-19", "date_type": "published", "publication": "Journal of Geophysical Research D", "volume": "113", "publisher": "American Geophysical Union", "pagerange": "D22301", "id_number": "CaltechAUTHORS:WANjgrd08", "issn": "0148-0227", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:WANjgrd08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" }, { "agency": "Caltech Summer Undergraduate Research Fellowship (SURF)" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1029/2008JD009883", "primary_object": { "basename": "WANjgrd08.pdf", "url": "https://authors.library.caltech.edu/records/xzqbn-53m36/files/WANjgrd08.pdf" }, "resource_type": "article", "pub_year": "2008", "author_list": "Wang, Shuhui; Pickett, Herbert M.; et el." }, { "id": "https://authors.library.caltech.edu/records/89qny-whj61", "eprint_id": 48802, "eprint_status": "archive", "datestamp": "2023-08-22 06:54:59", "lastmod": "2023-10-17 20:26:38", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "H. M." } }, { "id": "Read-W-G", "name": { "family": "Read", "given": "W. G." } }, { "id": "Lee-K-K", "name": { "family": "Lee", "given": "K. K." } }, { "id": "Yung-Y-L", "name": { "family": "Yung", "given": "Y. L." }, "orcid": "0000-0002-4263-2562" } ] }, "title": "Observation of night OH in the mesosphere", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2006 The American Geophysical Union.\n\nReceived 15 May 2006; Revised 14 August 2006; Accepted 30 August 2006; Published 6 October 2006.\n\nWe wish to thank C. Miller and S. Sander for valuable discussions and all who helped make the Aura OH measurements\npossible. KKL was supported by a Summer Undergraduate Research Fellowship at the California Institute of Technology. YLY was supported by NASA grant NNG04GD76G to the California Institute of Technology. Research at the Jet Propulsion Laboratory, California Institute of Technology,\nis performed under contract with the National Aeronautics and Space Administration.\n\nPublished - grl21867.pdf
Supplemental Material - grl21867-sup-0001-readme.txt
Supplemental Material - grl21867-sup-0002-ts01.txt
Supplemental Material - grl21867-sup-0003-ts01.pdf
", "abstract": "Satellite measurements from the Aura MLS instrument show a layer of OH near 82 km in the night. This layer confirms earlier measurements by ground-based LIDAR. The MLS and LIDAR observations measure OH in the lowest vibrational state and are distinct, but related chemically, from vibrationally-excited emission from the OH Meinel bands in the near infrared. The Caltech 1-D model has been extended to include vibrational dependence of OH reactions and shows good agreement with MLS OH data and with observations of the Meinel bands. The model shows a chemical lifetime of HO_x that increases from less than a day at 80 km to over a month at 87 km. Above this altitude transport processes become an important part of HO_x chemistry. The model predicts that ground state OH represents 99% of the total OH up to 84 km.", "date": "2006-10", "date_type": "published", "publication": "Geophysical Research Letters", "volume": "33", "number": "19", "publisher": "American Geophysical Union", "pagerange": "Art. No. L19808", "id_number": "CaltechAUTHORS:20140822-092816343", "issn": "0094-8276", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140822-092816343", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Caltech Summer Undergraduate Research Fellowship (SURF)" }, { "agency": "NASA", "grant_number": "NNG04GD76G" }, { "agency": "NASA/JPL/Caltech" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1029/2006GL026910", "primary_object": { "basename": "grl21867.pdf", "url": "https://authors.library.caltech.edu/records/89qny-whj61/files/grl21867.pdf" }, "related_objects": [ { "basename": "grl21867-sup-0001-readme.txt", "url": "https://authors.library.caltech.edu/records/89qny-whj61/files/grl21867-sup-0001-readme.txt" }, { "basename": "grl21867-sup-0002-ts01.txt", "url": "https://authors.library.caltech.edu/records/89qny-whj61/files/grl21867-sup-0002-ts01.txt" }, { "basename": "grl21867-sup-0003-ts01.pdf", "url": "https://authors.library.caltech.edu/records/89qny-whj61/files/grl21867-sup-0003-ts01.pdf" } ], "resource_type": "article", "pub_year": "2006", "author_list": "Pickett, H. M.; Read, W. G.; et el." }, { "id": "https://authors.library.caltech.edu/records/h0fxs-wks89", "eprint_id": 34202, "eprint_status": "archive", "datestamp": "2023-08-22 01:03:23", "lastmod": "2023-10-19 14:44:11", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kleiner-I", "name": { "family": "Kleiner", "given": "I." } }, { "id": "Tarrago-G", "name": { "family": "Tarrago", "given": "G." } }, { "id": "Cottaz-C", "name": { "family": "Cottaz", "given": "C." } }, { "id": "Sagui-L", "name": { "family": "Sagui", "given": "L." } }, { "id": "Brown-L-R", "name": { "family": "Brown", "given": "L. R." } }, { "id": "Poynter-R-L", "name": { "family": "Poynter", "given": "R. L." } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "H. M." } }, { "id": "Chen-P", "name": { "family": "Chen", "given": "P." } }, { "id": "Pearson-J-C", "name": { "family": "Pearson", "given": "J. C." } }, { "id": "Sams-R-L", "name": { "family": "Sams", "given": "R. L." } }, { "id": "Blake-G-A", "name": { "family": "Blake", "given": "G. A." }, "orcid": "0000-0003-0787-1610" }, { "id": "Matsuura-Shuji", "name": { "family": "Matsuura", "given": "S." }, "orcid": "0000-0002-5698-9634" }, { "id": "Nemtchinov-V", "name": { "family": "Nemtchinov", "given": "V." } }, { "id": "Varanasi-P", "name": { "family": "Varanasi", "given": "P." } }, { "id": "Fusina-L", "name": { "family": "Fusina", "given": "L." } }, { "id": "Di-Lonardo-G", "name": { "family": "Di Lonardo", "given": "G." } } ] }, "title": "NH_3 and PH_3 line parameters: the 2000 HITRAN update and new results", "ispublished": "pub", "full_text_status": "restricted", "keywords": "Ammonia; Phosphine; Molecular parameters; Database", "note": "\u00a9 2003 Elsevier Ltd. \n\nReceived 30 January 2003; received in revised form 24 March 2003; accepted 27 March 2003.\n\nThe research at the Jet Propulsion Laboratory (JPL), California Institute of Technology and the University of New York at Stonybrook was performed under contract with the National Aeronautics and Space Administration. The United States Department of Energy supported part of this research and was conducted at the W. R. Riley Environmental Molecular Sciences Laboratory, a national scientic user facility sponsored by the Department of Energy's OOce of Biological and Environmental Research located at the Pacific Northwest National Laboratory (PNNL). PNNL is operated for the United States Department of Energy by Battelle under contract No. DE-AC06-76RLO 1830. One of us (IK) would like to thank the French Programme National de Plan\u00e9tologie (PNP) for funding this research. GAB gratefully acknowledges support from the NASA SARA program.", "abstract": "This paper describes the improvements incorporated into the 2000 version of the HITRAN database for ammonia (NH_3), as well as newer results for phosphine (PH_3) not included in HITRAN 2000. For ammonia, the HITRAN 2000 database contains some 29084 ammonia lines, more than double the number of lines in HITRAN 1996. Specifically, the 2000 update involved replacing pure-rotational and infrared transitions from 0 to 3700 cm^(-1) with new calculations for the ^(14)NH_3 isotopomer, whereas in the 4000 to 5000 cm^(-1) region, parameters from the 1996 database were retained. The rotational quantum number range for line positions, intensities and line broadening parameters updated in this new HITRAN version goes up to J=22, 15, 13 and 10 in the 8\u20131000 \u03bcm, 5 \u03bcm, 4 \u03bcm and 2.8\u20133.3 \u03bcm spectral regions respectively. For phosphine, a new database from 770 to 2156 cm^(-1) available for future updates is described and contrasted with parameters in HITRAN 2000.", "date": "2003-11", "date_type": "published", "publication": "Journal of Quantitative Spectroscopy and Radiative Transfer", "volume": "82", "number": "1-4", "publisher": "Elsevier", "pagerange": "293-312", "id_number": "CaltechAUTHORS:20120919-095012483", "issn": "0022-4073", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120919-095012483", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)" }, { "agency": "Programme National de Planetologie (PNP)" }, { "agency": "NASA" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1016/S0022-4073(03)00159-6", "resource_type": "article", "pub_year": "2003", "author_list": "Kleiner, I.; Tarrago, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/2k7g2-gz531", "eprint_id": 34092, "eprint_status": "archive", "datestamp": "2023-08-22 00:59:26", "lastmod": "2023-10-19 14:30:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chen-Pin", "name": { "family": "Chen", "given": "Pin" } }, { "id": "Pearson-J-C", "name": { "family": "Pearson", "given": "J. C." } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } }, { "id": "Matsuura-Shuji", "name": { "family": "Matsuura", "given": "Shuji" }, "orcid": "0000-0002-5698-9634" }, { "id": "Blake-G-A", "name": { "family": "Blake", "given": "Geoffrey A." }, "orcid": "0000-0003-0787-1610" } ] }, "title": "Submillimeter-Wave Measurements and Analysis of the Ground and \u03bd2 = 1 States of Water", "ispublished": "pub", "full_text_status": "public", "keywords": "infrared: ISM; ISM: lines and bands; ISM: molecules; methods: laboratory; molecular data", "note": "\u00a9 2000 American Astronomical Society.\n\nReceived 1999 July 15; accepted 1999 November 24.\n\nParts of the research described in this paper were carried\nout by the Jet Propulsion Laboratory, California Institute\nof Technology, under contract with the National Aeronautics\nand Space Administration (NASA). G. A. Blake acknowledges the support of NASA and the National Science Foundation. We thank Simon Verghese of MIT Lincoln Laboratories for supplying the photomixers used in this study. J. C. Pearson thanks Robert A. Toth for making available his latest water measurements prior to publication and for useful discussions concerning their analysis.\n\nPublished - 0067-0049_128_1_371.pdf
", "abstract": "In order to facilitate further studies of water in the interstellar medium, the envelopes of late-type stars, jets, and shocked regions, the frequencies of 17 newly measured H_2 ^(16)O transitions between 0.841 and 1.575 THz are reported. A complete update of the available water line frequencies and a detailed calculation of unmeasured rotational transitions and transition intensities as a function of temperature are presented for the ground and \u03bd_2 = 1 state levels below 3000 cm^(-1) of excitation energy. The new terahertz transitions were measured with a recently developed laser difference frequency spectrometer. Six of these transitions arise from the \u03bd_2 = 1 state, and the other 11 are in the ground state; all have lower state energies from 700 to 1750 cm^(-1) and should be accessible to Stratospheric Observatory For Infrared Astronomy (SOFIA) through the atmosphere. The transitions near 0.850 THz are accessible from the ground with existing receivers. Observations of the newly measured \u03bd_2 = 1 state transitions, which include the 1_(1, 1)-0_(0, 0) fundamental at 1.2057 THz and five other very low J transitions, should provide valuable insights into role played by the \u03bd2 = 1 state in the cooling dynamics of jets, shocks, masers, and strongly infrared-pumped regions. The line list is presented to assist in the planning of observational campaigns with the Far-Infrared Space Telescope (FIRST) and other proposed space missions with which a full suite of water observations can be carried out.", "date": "2000-05", "date_type": "published", "publication": "Astrophysical Journal Supplement Series", "volume": "128", "number": "1", "publisher": "American Astronomical Society", "pagerange": "371-385", "id_number": "CaltechAUTHORS:20120914-103111591", "issn": "0067-0049", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120914-103111591", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" }, { "agency": "NSF" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1086/313377", "primary_object": { "basename": "0067-0049_128_1_371.pdf", "url": "https://authors.library.caltech.edu/records/2k7g2-gz531/files/0067-0049_128_1_371.pdf" }, "resource_type": "article", "pub_year": "2000", "author_list": "Chen, Pin; Pearson, J. C.; et el." }, { "id": "https://authors.library.caltech.edu/records/y09ty-0hy87", "eprint_id": 34074, "eprint_status": "archive", "datestamp": "2023-08-22 00:57:09", "lastmod": "2023-10-18 21:49:45", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Matsuura-Shuji", "name": { "family": "Matsuura", "given": "Shuji" }, "orcid": "0000-0002-5698-9634" }, { "id": "Chen-Pin", "name": { "family": "Chen", "given": "Pin" } }, { "id": "Blake-G-A", "name": { "family": "Blake", "given": "Geoffrey A." }, "orcid": "0000-0003-0787-1610" }, { "id": "Pearson-J-C", "name": { "family": "Pearson", "given": "John C." } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } } ] }, "title": "A tunable cavity-locked diode laser source for terahertz photomixing", "ispublished": "pub", "full_text_status": "public", "keywords": "calibration; diode lasers; photomixing; source; terahertz waves", "note": "\u00a9 2000 IEEE.\n\nManuscript received September 29, 1998; revised December 10, 1999. This\nwork was supported by the National Aeronautics and Space Administration\nunder a contract. The work of G. A. Blake was supported by the National Aeronautics\nand Space Administration, and by the National Science Foundation.\nThe authors would like to thank S. Verghese and K. A. McIntosh,\nMIT Lincoln Laboratory, Cambridge, for preparing the\nLTG\u2013GaAs photomixers. The authors also thank T. J. Crawford,\nJet Propulsion Laboratory, California Institute of Technology,\nPasadena, CA, for his technical support. Portions of this work\nwere performed at the Jet Propulsion Laboratory.\n\nPublished - 00826836.pdf
", "abstract": "An all solid-state approach to the precise frequency synthesis and control of widely tunable terahertz radiation by differencing continuous-wave diode lasers at 850 nm is reported in this paper. The difference frequency is synthesized by three fiber-coupled external-cavity laser diodes. Two of the lasers are Pound-Drever-Hall locked to different orders of a Fabry-Perot (FP) cavity, and the third is offset-frequency locked to the second of the cavity-locked lasers using a tunable microwave oscillator. The first cavity-locked laser and the offset-locked laser produce the difference frequency, whose value is accurately determined by the sum of an integer multiple of the free spectral range of the FP cavity and the offset frequency. The dual-frequency 850-nm output of the three laser system is amplified to 500 mW through two-frequency injection seeding of a single semiconductor tapered optical amplifier. As proof of precision frequency synthesis and control of tunability, the difference frequency is converted into a terahertz wave by optical-heterodyne photomixing in low-temperature-grown GaAs and used for the spectroscopy of simple molecules. The 3-dB spectral power bandwidth of the terahertz radiation is routinely observed to be \u227e1 MHz. A simple, but highly accurate, method of obtaining an absolute frequency calibration is proposed and an absolute calibration of 10^(-7) demonstrated using the known frequencies of carbon monoxide lines between 0.23-1.27 THz.", "date": "2000-03", "date_type": "published", "publication": "IEEE Transactions on Microwave Theory and Techniques", "volume": "48", "number": "3", "publisher": "IEEE", "pagerange": "380-387", "id_number": "CaltechAUTHORS:20120913-144928826", "issn": "0018-9480", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120913-144928826", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" }, { "agency": "NSF" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1109/22.826836", "primary_object": { "basename": "00826836.pdf", "url": "https://authors.library.caltech.edu/records/y09ty-0hy87/files/00826836.pdf" }, "resource_type": "article", "pub_year": "2000", "author_list": "Matsuura, Shuji; Chen, Pin; et el." }, { "id": "https://authors.library.caltech.edu/records/np11r-ge035", "eprint_id": 34200, "eprint_status": "archive", "datestamp": "2023-08-22 12:54:05", "lastmod": "2023-10-19 14:44:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Matsuura-Shuji", "name": { "family": "Matsuura", "given": "Shuji" }, "orcid": "0000-0002-5698-9634" }, { "id": "Chen-Pin", "name": { "family": "Chen", "given": "Pin" } }, { "id": "Blake-G-A", "name": { "family": "Blake", "given": "Geoffrey A." }, "orcid": "0000-0003-0787-1610" }, { "id": "Pearson-J-C", "name": { "family": "Pearson", "given": "J. C." } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } } ] }, "title": "Simultaneous Amplification of Terahertz Difference Frequencies by an Injection-Seeded Semiconductor Laser Amplifier at 850 nm", "ispublished": "pub", "full_text_status": "restricted", "keywords": "Semiconductor laser amplifier; Two-frequency injection\nseeding; Difference-frequency generation; Submillimeter; Terahertz; Coherent radiation", "note": "\u00a9 1998 Springer.\n\nReceived March 27, 1998.\n\nWe thank T. J. Crawford of Jet Propulsion Laboratory for his technical support. This work was supported by the National Aeronautics and Space Administration. G. A. Blake acknowledges additional support from the National Science Foundation.", "abstract": "Two-frequency operation of an 850 nm semiconductor optical amplifier was achieved by simultaneously injection seeding it with two diode lasers. The two frequencies could be independently amplified without strong interference when they were separated by more than 10 GHz, and the spectral purity was preserved by the amplification process. At frequency differences below 10 GHz, unbalanced two-frequency output was observed, which can be explained by a two-mode interaction driven by the refractive index modulation at the beat frequency. The laser system is\nsuitable for the difference-frequency generation of coherent terahertz radiation in ultra-fast photoconductors or nonlinear optical media.", "date": "1998-06", "date_type": "published", "publication": "International Journal of Infrared and Millimeter Waves", "volume": "19", "number": "6", "publisher": "Plenum Publishing Corporation", "pagerange": "849-858", "id_number": "CaltechAUTHORS:20120919-094928326", "issn": "0195-9271", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120919-094928326", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" }, { "agency": "NSF" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1023/A:1022676407601", "resource_type": "article", "pub_year": "1998", "author_list": "Matsuura, Shuji; Chen, Pin; et el." }, { "id": "https://authors.library.caltech.edu/records/28xav-ngm94", "eprint_id": 34004, "eprint_status": "archive", "datestamp": "2023-08-22 04:39:11", "lastmod": "2023-10-18 21:45:27", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Blake-G-A", "name": { "family": "Blake", "given": "Geoffrey A." }, "orcid": "0000-0003-0787-1610" }, { "id": "Farhoomand-J", "name": { "family": "Farhoomand", "given": "Jam" } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } } ] }, "title": "The Far-Infrared Rotational Spectrum of X^2\u220f OH Notes", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 1986 Academic Press, Inc. We thank E. A. Cohen for his help and useful discussions during the course of these experiments. We also thank K. M. Evenson and J. W. C. Johns for providing the calibration frequencies prior to publication.\nThe research described in this paper was performed by the Jet Propulsion Laboratory, California Institute\nof Technology, under contract with the National Aeronautics and Space Administration.", "abstract": "We have previously reported the direct (zero-field) measurement of the fundamental rotational transitions\nof the hydroxyl radical using a recently developed far-infrared (FIR) laser sideband spectrometer (/). This\nnote presents a more extensive set of measurements of the pure rotational spectrum of OH, which we combine with existing microwave, infrared, and optical data to produce an optimized set of molecular constants.", "date": "1986-01", "date_type": "published", "publication": "Journal of Molecular Spectroscopy", "volume": "115", "number": "1", "publisher": "Elsevier", "pagerange": "226-228", "id_number": "CaltechAUTHORS:20120911-141811153", "issn": "0022-2852", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120911-141811153", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1016/0022-2852(86)90289-4", "resource_type": "article", "pub_year": "1986", "author_list": "Blake, Geoffrey A.; Farhoomand, Jam; et el." }, { "id": "https://authors.library.caltech.edu/records/w8vgr-yav58", "eprint_id": 33992, "eprint_status": "archive", "datestamp": "2023-08-22 04:21:06", "lastmod": "2023-10-18 21:44:54", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Farhoomand-J", "name": { "family": "Farhoomand", "given": "Jam" } }, { "id": "Blake-G-A", "name": { "family": "Blake", "given": "Geoffrey A." }, "orcid": "0000-0003-0787-1610" }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } } ] }, "title": "Direct measurement of the fundamental rotational transitions of the OH radical by laser sideband spectroscopy", "ispublished": "pub", "full_text_status": "public", "keywords": "laboratory spectra; molecular processes", "note": "\u00a9 1985 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1984 November 30; accepted 1985 January 8. We would like to thank Dr. K. M. Evenson of the National Bureau of Standards, Boulder, for providing his measured CO frequencies prior to publication, and Dr. E. A Cohen for useful discussions during the course of this work. We would also like to thank M. Schaefer for his assistance on the Schottky diode mixer. The research described in this paper\nwas performed by the Jet Propulsion Laboratory, California\nInstitute of Technology, under contract with the National\nAeronautics and Space Administration.\n\nPublished - 1985ApJ___291L__19F.pdf
", "abstract": "We report for the first time the direct (zero-field) spectra of the fundamental rotational transitions of the OH\nradical in its \u03a9 = 3/2 and 1/2 states at 2509.9 and 1834.7 GHz using a recently developed far-infrared laser\nsideband spectrometer. These measurements have verified and refined the predictions of previous laser magnetic\nresonance (LMR) work, thereby confirming the far-infrared detection of interstellar OH. The increased accuracy\nof these direct measurements will be useful to future astronomical and atmospheric studies of these important\ntransitions.", "date": "1985-04-01", "date_type": "published", "publication": "Astrophysical Journal Letters", "volume": "291", "number": "1", "publisher": "American Astronomical Society", "pagerange": "L19-L22", "id_number": "CaltechAUTHORS:20120911-111155158", "issn": "2041-8205", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120911-111155158", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1086/184450", "primary_object": { "basename": "1985ApJ___291L__19F.pdf", "url": "https://authors.library.caltech.edu/records/w8vgr-yav58/files/1985ApJ___291L__19F.pdf" }, "resource_type": "article", "pub_year": "1985", "author_list": "Farhoomand, Jam; Blake, Geoffrey A.; et el." }, { "id": "https://authors.library.caltech.edu/records/ekn5m-z2013", "eprint_id": 32164, "eprint_status": "archive", "datestamp": "2023-08-22 04:19:00", "lastmod": "2023-10-17 23:00:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Farhoomand-J", "name": { "family": "Farhoomand", "given": "Jam" } }, { "id": "Blake-G-A", "name": { "family": "Blake", "given": "Geoffrey A." }, "orcid": "0000-0003-0787-1610" }, { "id": "Frerking-M-A", "name": { "family": "Frerking", "given": "M. A." } }, { "id": "Pickett-H-M", "name": { "family": "Pickett", "given": "Herbert M." } } ] }, "title": "Generation of tunable laser sidebands in the far-infrared region", "ispublished": "pub", "full_text_status": "public", "keywords": "TUNING, FAR INFRARED RADIATION, OPTICAL PUMPING, MICROWAVE RADIATION, KLYSTRONS, SCHOTTKY BARRIER DIODES, CARBON DIOXIDE LASERS, LASERS, GHZ RANGE 100\u22121000, HEAVY WATER, FORMALDEHYDE, EFFICIENCY, EXPERIMENTAL DATA, POWER, HARMONICS, COUPLING, MICHELSON INTERFEROMETER, MIXING", "note": "\u00a9 1985 American Institute of Physics. Received 9 July 1984; accepted 22 October 1984. We would like to acknowledge Ed Cohen for his help with the rotational line measurements and Mark Schaefer for his work on the comer cube mixer used in these experiments. We would also like to thank Timothy Boyd for his early work on many of the components. The research described in this paper was performed by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.\n\nPublished - FARjap85.pdf
", "abstract": "Continuously tunable laser sidebands have been generated by mixing radiation from an optically pumped far infrared (FIR) molecular laser, operated at 693, 762, 1627, and 1839 GHz, with that from millimeter\u2010wave klystrons in a Schottky\u2010barrier diode. An enhancement in conversion efficiency over similar systems reported previously is obtained by using a Michelson interferometer to separate the sidebands from the carrier and by placing the Schottky diode in an open structure corner cube mount. With 4 mW of laser power at 693 and 762 GHz the sideband power was measured to be 3.0 \u03bcW. This is at least an order of magnitude better than the previously reported results. At higher frequencies, 22 mW of 1627\u2010GHz laser power produced about 2.5 \u03bcW of sideband output, while 3mW of 1839\u2010GHz laser power generated about 100 nW of sideband radiation. The lower efficiency at the higher frequencies is due primarily to the mismatch between the laser radiation and the fixed\u2010length diode antenna. To demonstrate the tunability of the generated far\u2010infrared radiation, the laser sidebands were swept through absorption lines of HDO and H_2CO near 600 and 800 GHz. The absorption signals were easily seen, using either video or lock\u2010in detection techniques.", "date": "1985-03-01", "date_type": "published", "publication": "Journal of Applied Physics", "volume": "57", "number": "5", "publisher": "American Institute of Physics", "pagerange": "1763-1766", "id_number": "CaltechAUTHORS:20120628-072530380", "issn": "0021-8979", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120628-072530380", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NASA" } ] }, "local_group": { "items": [ { "id": "Division-of-Geological-and-Planetary-Sciences" } ] }, "doi": "10.1063/1.334454", "primary_object": { "basename": "FARjap85.pdf", "url": "https://authors.library.caltech.edu/records/ekn5m-z2013/files/FARjap85.pdf" }, "resource_type": "article", "pub_year": "1985", "author_list": "Farhoomand, Jam; Blake, Geoffrey A.; et el." } ]