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1979 International Conference on Submillimeter Waves and Their Applications最新文献

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CH3F Laser Pumped with a Continuously Tunable, Multi-Atmosphere CO2 Laser CH3F激光泵浦连续可调，多大气CO2激光器
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335439
P. Mathieu, J. Izatt
{"title":"CH3F Laser Pumped with a Continuously Tunable, Multi-Atmosphere CO2 Laser","authors":"P. Mathieu, J. Izatt","doi":"10.1109/ICSWA.1979.9335439","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335439","url":null,"abstract":"While very powerful, narrow bandwidth, pulsed FIR lasers are being constructed for plasma diagnosis it is striking to observe that a very small number of rotational transitions of very few molecules are under investigation. This comes from the fact that many conditions must be fulfilled to obtain efficient pulsed FIR laser emission [1]. One of the most important is that the molecule used must be quite simple in order that the ground absorbing state contains a good fraction of the population of the molecules and that FIR reabsorption from rotational transitions of the ground state be negligible. Furthermore, a near coincidence is required between an absorption line of the molecule and an emission line of the CO2-TEA laser. If the first condition is unavoidable the second one might be circumvented by using a continuously tunable multi-atmosphere CO2 laser. Then it should be possible to pump a molecule which would be a good candidate on most of its vibrational rotational absorption lines. Let us take for example the CH3F molecule which has only been pumped via two of its absorption lines by the CO2-TEA laser (the Q (12) and P (32) of the C-F strech mode). The Q branch of CH3F is situated in a part of the spectrum contained between the 9P18 and 9P36 line of the CO2 molecule. In this branch, there are nearly forty CH3F absorption lines which could produce as much efficient millimeter and submillimeter lines. Some other lines in the P and R branches are also accessible with other parts of the CO2 laser spectrum, but they would lead to the same FIR lines.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115537935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and Fabrication of Improved Hybrid Output Couplers for Optically Pumped Far Infrared Lasers 光泵浦远红外激光器改进型混合输出耦合器的设计与制造
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335353
R. Cordero-Iannarella, E. Danielewicz, D. Hodges, N. Luhmann
{"title":"Design and Fabrication of Improved Hybrid Output Couplers for Optically Pumped Far Infrared Lasers","authors":"R. Cordero-Iannarella, E. Danielewicz, D. Hodges, N. Luhmann","doi":"10.1109/ICSWA.1979.9335353","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335353","url":null,"abstract":"The behavior of metal mesh dieletric mirrors (MMD) for far infrared applications has been extensively examined by several authors.[1-5] R. Ulrich [1] developed a simple model based on empirical results which are valid in the range 0<g/λ≤.6, where g is the grid constant and λ is the wavelength. His results are based on measurements performed on grids supported by very thin substrates unable to support resonances at the frequencies of interest so that etalon effects due to the substrate do not influence the frequency response of the grids. S. M. Wolfe et al. [2] expanded the analysis of Ulrich and approximated the effects of the substrate on the frequency response of MMD inductive mirrors. It was found that the frequency response of the grids is modified by the etalon effects due to the substrate and that, due to the rapid ocillations in the transmissivity of the mesh mirrors with wavelength, an accurate knowledge of the substrate thickness is necessary for proper design.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123509404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dispersion in a Laser Pumped Molecular Laser 激光泵浦分子激光器中的色散
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335441
B. Danly, R. Temkin
{"title":"Dispersion in a Laser Pumped Molecular Laser","authors":"B. Danly, R. Temkin","doi":"10.1109/ICSWA.1979.9335441","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335441","url":null,"abstract":"The dispersion equations have been derived for two laser fields of arbitrary intensity interacting with a homogeneously broadened, three-level molecular system. Good agreement is obtained between theoretical and experimental results for frequency detuning in a 385 μm, D2O laser and a 496 μm CH3F laser.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123990062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Very Short Far Infrared Pulses from Optically Pumped CH3OH/D, Chooh and CH3F Lasers using an Eq-Switched CO2 Laser as a Pump Source 使用eq开关CO2激光器作为泵浦光泵浦CH3OH/D, choh和CH3F激光器的极短远红外脉冲
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335438
H. Bluyssen, A. van Etteger, J. Maan, P. Wyder
{"title":"Very Short Far Infrared Pulses from Optically Pumped CH3OH/D, Chooh and CH3F Lasers using an Eq-Switched CO2 Laser as a Pump Source","authors":"H. Bluyssen, A. van Etteger, J. Maan, P. Wyder","doi":"10.1109/ICSWA.1979.9335438","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335438","url":null,"abstract":"This paper describes the generation of far infrared pulses with a risetime of 10−8s from optically pumped CH3OH/D, CHOOH and CH3F lasers using a Q-switched current pulsed CO2 laser as a pump source. The pump source consists of a conventional tunable low pressure (20 Torr) CO2 laser which is Q-switched by a rotating mirror mounted on an air-driven spindle. Discharge current pulses up to 200 mA and 100-300 μs duration are produced and synchronized to the Q-switch by a trigger pulse from the rotating mirror. Due to the high discharge current, output powers are increased by at least a factor 5 with respect to Q-switched pulses from a d.c. current mode (20 mA). This leads to kW peak power pulses even at transitions such as 9P38, 9P6 and 9R6 which are especially important for pumping CH3OH and CH3OD. The pump pulses are focussed by an f = 50 cm mirror onto the 1 mm incoupling hole of the FIR cavity, which consists of a 1 m long 13 mm diameter quartz tube and two 25 mm diameter flat mirrors.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127114688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Theory of Electron Cyclotron Maser Devices 电子回旋脉泽装置的理论
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335367
P. Sprangle, K. Chu, R. Smith, V. L. Granastein
{"title":"The Theory of Electron Cyclotron Maser Devices","authors":"P. Sprangle, K. Chu, R. Smith, V. L. Granastein","doi":"10.1109/ICSWA.1979.9335367","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335367","url":null,"abstract":"The electron cyclotron maser (gyrotron) is an extremely promising device for efficiently generating coherent, high-power millimeter and sub-millimeter radiation. This paper describes the physical mechanism of the maser as well as the recent theoretical progress made in dramatically a) enhancing the maser efficiency by contouring the external magnetic field and b) increasing the operating bandwidth in the slow wave maser amplifier by employing a dielectrically loaded waveguide.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128811223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Water Vapor Attenuation of HF/CO2 Lasers HF/CO2激光器的水汽衰减
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335390
R. Spellicy, B. Sojka, K. O. White
{"title":"Water Vapor Attenuation of HF/CO2 Lasers","authors":"R. Spellicy, B. Sojka, K. O. White","doi":"10.1109/ICSWA.1979.9335390","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335390","url":null,"abstract":"A resonant spectrophone has been used with a pulsed laser source to study water vapor attenuations of HF/CO2 lasers/as a function of pressure and temperature. Comparisons have been made with calculations based on the AFGL absorption line compilation.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121618095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photon Drag and Radiation Pressure in Refractive Media 折射介质中的光子阻力和辐射压力
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335373
D. Evans, A. Gibson, M. Kimmitt, A. Koohian, G. Levy
{"title":"Photon Drag and Radiation Pressure in Refractive Media","authors":"D. Evans, A. Gibson, M. Kimmitt, A. Koohian, G. Levy","doi":"10.1109/ICSWA.1979.9335373","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335373","url":null,"abstract":"The correct expression for momentum density and hence pressure of radiation in a medium of refractive index n has been an open question for half a century. According to Minkowski[1], it depends on DxB and the momentum of a photon should be nhv/c, whereas Abraham[2] favours an ExH dependence leading to photon momentum hv/nc.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116158994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detection of NMMW Radiation with Mercury Cadmium Telluride 碲化汞镉对毫米波辐射的检测
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335395
B. Weber, S. M. Kulpa
{"title":"Detection of NMMW Radiation with Mercury Cadmium Telluride","authors":"B. Weber, S. M. Kulpa","doi":"10.1109/ICSWA.1979.9335395","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335395","url":null,"abstract":"The need for semiconductors with a variable valence to conduction bandgap has led to the study of various ternary compounds. Among these, [Hg,Cd]Te has been developed for use as detectors [1] and lasers [2,3] in the 8 to 14-μm spectral region. We report the first observation of hot-electron photoconductive detection of near-millimeter wave (NMMW) radiation using [Hg,Cd]Te.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121680199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetoplasma-Reflectivity of Pb1-XGeXTe Pb1-XGeXTe的磁等离子体反射率
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335446
J. Burkhart, G. Bauer, W. Jantsch, A. Lopez‐Otero
{"title":"Magnetoplasma-Reflectivity of Pb1-XGeXTe","authors":"J. Burkhart, G. Bauer, W. Jantsch, A. Lopez‐Otero","doi":"10.1109/ICSWA.1979.9335446","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335446","url":null,"abstract":"Pb<inf>1-X</inf>Ge<inf>X</inf>Te exhibits a structural phase transition from the cubic NaCl(O<inf>h</inf>) to the rhombohedral As-like structure (C<inf>3v</inf>) at low lattice temperatures [1]. The transition temperature T<inf>C</inf> is a steep function of the Ge content. The infrared active mode of the cubic structure is split into an A<inf>1</inf>-mode and a double degenerate E-mode. These modes are both infrared and Raman active. A<inf>1</inf> is observable for the polarization <sup>→</sup>E‖ c-axis [2,3]. In the cubic phase, electrons or holes are located in four equivalent L-valleys. Below T<inf>C</inf>, there are three equivalent L-valleys, and along the direction of the c-axis a T-valley.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132764709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prospects for a Tunable, High Power CH3F Laser 可调谐高功率CH3F激光器的前景
1979 International Conference on Submillimeter Waves and Their Applications Pub Date : 1979-12-01 DOI: 10.1109/ICSWA.1979.9335437
R. Temkin, D. Biron, B. Danly, B. Lax
{"title":"Prospects for a Tunable, High Power CH3F Laser","authors":"R. Temkin, D. Biron, B. Danly, B. Lax","doi":"10.1109/ICSWA.1979.9335437","DOIUrl":"https://doi.org/10.1109/ICSWA.1979.9335437","url":null,"abstract":"Laser pumping of CH3F with high intensity radiation [1] from a grating tuned CO2 TEA has produced Raman far-infrared (FIR) emission with pump offsets as large as 20 GHz. Analysis of these results suggests that a nearly continuously tunable FIR laser could be constructed if a tunable pump source were utilized. This system would be similar in principle to the tunable FIR sources using the diatomic molecules HF [2] and HCL [3]. A tunable CH3F laser, however, would have the advantages of a higher overall efficiency and narrower bandwidth. We present a theoretical analysis which predicts the tuning behavior of such a tunable CH3F laser. Data previously taken [1] with a grating tuned CO2 TEA laser are used to determine the necessary pump intensity and the operating pressure.","PeriodicalId":216123,"journal":{"name":"1979 International Conference on Submillimeter Waves and Their Applications","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1979-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117136061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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