Pub Date : 1987-12-01DOI: 10.1109/IRMM.1987.9126970
P. Goldsmith, E. L. Moore
We have developed a compact system of Gaussian beam waveguide using low loss lenses which is useful for test bench as well as subsystem applications. The frequency range from 75 GHz (4mm wavelength) to 300 GHz (1mm wavelength) is covered in octave bandwidths. OptiguideTM Gaussian beam waveguide can handle multiple polarizations, and can be adapted to handle multiple spatial modes as well. To date, we have developed 3- and 4-port directional couplers, attenuators, isolators, and circulators. Polarization processing components include grids which can act as polarization diplexers or analyzers, half-wave plates, and quarter-wave plates. The modular approach readily lends itself to configuring of systems to provide a wide range of functions. Some data on a 140–220 GHz (WR-5 waveguide band) system are presented,
{"title":"A nodular approach to beam waveguide — the optiguidetm system","authors":"P. Goldsmith, E. L. Moore","doi":"10.1109/IRMM.1987.9126970","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9126970","url":null,"abstract":"We have developed a compact system of Gaussian beam waveguide using low loss lenses which is useful for test bench as well as subsystem applications. The frequency range from 75 GHz (4mm wavelength) to 300 GHz (1mm wavelength) is covered in octave bandwidths. OptiguideTM Gaussian beam waveguide can handle multiple polarizations, and can be adapted to handle multiple spatial modes as well. To date, we have developed 3- and 4-port directional couplers, attenuators, isolators, and circulators. Polarization processing components include grids which can act as polarization diplexers or analyzers, half-wave plates, and quarter-wave plates. The modular approach readily lends itself to configuring of systems to provide a wide range of functions. Some data on a 140–220 GHz (WR-5 waveguide band) system are presented,","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117253413","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}
Pub Date : 1987-12-01DOI: 10.1109/IRMM.1987.9127022
T. Hori, T. Matsui, K. Araki, H. Inomata
A scanning Fabry-Perot interferometer with selectable reflection-finesse is proposed for wide range operation over millimeter and submillimeter waves. The stripe directions of the two striped polarizing reflectors are made slightly different and the reflectance is varied according to the relative angle of two stripe directions. The optimization of reflection-finesse for frequency measurements is achieved by adjusting the relative angle. The experimental results show the possibility of selecting reflection-finesse over wide frequency range without exchanging reflectors.
{"title":"Selectable-finesse fabry-perot interferometer for the frequency measurements of millimeter and submillimeter waves","authors":"T. Hori, T. Matsui, K. Araki, H. Inomata","doi":"10.1109/IRMM.1987.9127022","DOIUrl":"https://doi.org/10.1109/IRMM.1987.9127022","url":null,"abstract":"A scanning Fabry-Perot interferometer with selectable reflection-finesse is proposed for wide range operation over millimeter and submillimeter waves. The stripe directions of the two striped polarizing reflectors are made slightly different and the reflectance is varied according to the relative angle of two stripe directions. The optimization of reflection-finesse for frequency measurements is achieved by adjusting the relative angle. The experimental results show the possibility of selecting reflection-finesse over wide frequency range without exchanging reflectors.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117277972","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127043
P. Camesecchi, G. Moruzzi, F. Strumia, R. Lees
The CH3OH line frequencies obtained from the diagonalization of a theoretical Hamiltonian are affected by inaccuracies of the order of 10−3 ∼ 10−1 cm−1 or higher, the inaccuracy increasing with the value of the quantum numbers involved in the transition. The inaccuracy on lines involving vibrationally excited levels, like, for instance, the lasing lines, is usually higher than the inaccuracy on the absorption lines within the vibrational ground state.
{"title":"Ch3oh laser lines assignments and frequency predictions by transition loops","authors":"P. Camesecchi, G. Moruzzi, F. Strumia, R. Lees","doi":"10.1109/irmm.1987.9127043","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127043","url":null,"abstract":"The CH3OH line frequencies obtained from the diagonalization of a theoretical Hamiltonian are affected by inaccuracies of the order of 10−3 ∼ 10−1 cm−1 or higher, the inaccuracy increasing with the value of the quantum numbers involved in the transition. The inaccuracy on lines involving vibrationally excited levels, like, for instance, the lasing lines, is usually higher than the inaccuracy on the absorption lines within the vibrational ground state.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"5 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117338596","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126987
Gong Jianming, L. Shenggang
Eigenvalues and fields of TE10 and TE30 modes in a ridged waveguide are derived in this paper. The field distribution of TE10 indicates the difficulty of peniotron's realization in the waveguide. After comparing the fields of TE10 and TE30 with that of TE10 and TE30 rectangular waveguide modes, nonlinear calculations have been carried out on models of large-orbit gyrotron oscillators with a ridged resonator or a rectangular one. It has been studied that the transverse fields affect the efficiency of the gyrotron at the fundamental or the third cyclotron harmonic. The computational results show the gyrotron oscillator at the third cyclotron harmonic and using TE301 in the ridged waveguide has 51% high efficiency.
{"title":"The third cyclotron harmonic gyromonotron with a ridged waveguide","authors":"Gong Jianming, L. Shenggang","doi":"10.1109/irmm.1987.9126987","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126987","url":null,"abstract":"Eigenvalues and fields of TE10 and TE30 modes in a ridged waveguide are derived in this paper. The field distribution of TE10 indicates the difficulty of peniotron's realization in the waveguide. After comparing the fields of TE10 and TE30 with that of TE10 and TE30 rectangular waveguide modes, nonlinear calculations have been carried out on models of large-orbit gyrotron oscillators with a ridged resonator or a rectangular one. It has been studied that the transverse fields affect the efficiency of the gyrotron at the fundamental or the third cyclotron harmonic. The computational results show the gyrotron oscillator at the third cyclotron harmonic and using TE301 in the ridged waveguide has 51% high efficiency.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116275870","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126888
W. Ho
Experimental measurement techniques have been developed for utilizing spot-focusing and collimating lens antennas to determine the millimeter-wave dielectric properties of planar samples over the frequency range 30–140 GHz at temperatures up to 1600°C. The method is suitable for studying the average bulk-sample dielectric properties as well as inhomogeneities on the dimensional scale of a wavelength. Other significant advantages of the method include: thermal isolation of the sample from the measurement apparatus, minimum sample preparation requirements, and convenience for screening a large number of samples in relatively short time periods. The measurement apparatus has been used to study a wide variety of materials, which has led to successful models for explaining the observed temperature dependence of the dielectric properties of polycrystalline ceramics.
{"title":"High-temperature millimeter-wave dielectric measurements by free-space techniques","authors":"W. Ho","doi":"10.1109/irmm.1987.9126888","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126888","url":null,"abstract":"Experimental measurement techniques have been developed for utilizing spot-focusing and collimating lens antennas to determine the millimeter-wave dielectric properties of planar samples over the frequency range 30–140 GHz at temperatures up to 1600°C. The method is suitable for studying the average bulk-sample dielectric properties as well as inhomogeneities on the dimensional scale of a wavelength. Other significant advantages of the method include: thermal isolation of the sample from the measurement apparatus, minimum sample preparation requirements, and convenience for screening a large number of samples in relatively short time periods. The measurement apparatus has been used to study a wide variety of materials, which has led to successful models for explaining the observed temperature dependence of the dielectric properties of polycrystalline ceramics.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114201162","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127072
P. Woskoboinikow, D. Cohn, J. Machuzak, R. Myer, D. Rhee
Collective Thomson scattering can be used to diagnose localized ion temperature as well as alpha particle velocity distribution and density in a D-T burning tokamak. With one diagnostic beam a simultaneous, but independent, measure of the bulk ion temperature and alpha particle parameters can be made. Use of a long pulse, millimeter-wave gyrotron offers a significant margin in signal to noise ratio capability (√Δfτ > 1,000) not previously possible with lasers.
{"title":"Gyrotron thomson scattering diagnostics of ions in D-T burning tokamaks","authors":"P. Woskoboinikow, D. Cohn, J. Machuzak, R. Myer, D. Rhee","doi":"10.1109/irmm.1987.9127072","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127072","url":null,"abstract":"Collective Thomson scattering can be used to diagnose localized ion temperature as well as alpha particle velocity distribution and density in a D-T burning tokamak. With one diagnostic beam a simultaneous, but independent, measure of the bulk ion temperature and alpha particle parameters can be made. Use of a long pulse, millimeter-wave gyrotron offers a significant margin in signal to noise ratio capability (√Δfτ > 1,000) not previously possible with lasers.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114689612","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127016
A. A. Reeder, B. McCombe, F. Chambers, G. Devane
Far infrared transmission has been used to study beryllium acceptors doped in the center of GaAs/AlGaAs quantum wells and bulk GaAs. From the infrared measurements a binding energy of 28.5meV was inferred, in agreement with photoluminescence measurements. The effects of confinement are evident in shifts to progressively higher frequencies of the dominant transitions as the well width is decreased from 200Å to 100Å. The magnetic field dependence of the observed transitions has been investigated between 0 and 9.0T at temperatures between 4.2 and 30K for the bulk sample and 200Å well width sample. The shifts of the transitions with magnetic field are much smaller than predicted by recent calculations for confined acceptors.
{"title":"A far infrared study of shallow acceptors in gaas/algaas quantum wells","authors":"A. A. Reeder, B. McCombe, F. Chambers, G. Devane","doi":"10.1109/irmm.1987.9127016","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127016","url":null,"abstract":"Far infrared transmission has been used to study beryllium acceptors doped in the center of GaAs/AlGaAs quantum wells and bulk GaAs. From the infrared measurements a binding energy of 28.5meV was inferred, in agreement with photoluminescence measurements. The effects of confinement are evident in shifts to progressively higher frequencies of the dominant transitions as the well width is decreased from 200Å to 100Å. The magnetic field dependence of the observed transitions has been investigated between 0 and 9.0T at temperatures between 4.2 and 30K for the bulk sample and 200Å well width sample. The shifts of the transitions with magnetic field are much smaller than predicted by recent calculations for confined acceptors.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"10 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126036740","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127033
C. Tzuang, J. Kuo, S. Kao, S. Su, K. Chang
Picosecond ultra high speed pulse propagation along a coupled slotline integrated on a lossy multilayer substrate is investigated by full wave spectral domain analysis with improved accuracy. The theoretical results based on both even and odd mode excitations of a coupled slotline are presented.
{"title":"Analyses of picosecond pulse propagation along a coupled slotline on a lossy multilayer integrated circuit substrate","authors":"C. Tzuang, J. Kuo, S. Kao, S. Su, K. Chang","doi":"10.1109/irmm.1987.9127033","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127033","url":null,"abstract":"Picosecond ultra high speed pulse propagation along a coupled slotline integrated on a lossy multilayer substrate is investigated by full wave spectral domain analysis with improved accuracy. The theoretical results based on both even and odd mode excitations of a coupled slotline are presented.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123531508","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9127003
A. Perera, D. Coon
An injection pulse phenomenon1,2 which can be used to detect infrared (IR) radiation without the use of preamplifiers at 4.2K is described and analyzed.
描述并分析了在4.2K下不使用前置放大器即可检测红外(IR)辐射的注入脉冲现象1,2。
{"title":"Far infrared detection without preamplifiers","authors":"A. Perera, D. Coon","doi":"10.1109/irmm.1987.9127003","DOIUrl":"https://doi.org/10.1109/irmm.1987.9127003","url":null,"abstract":"An injection pulse phenomenon1,2 which can be used to detect infrared (IR) radiation without the use of preamplifiers at 4.2K is described and analyzed.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131560932","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}
Pub Date : 1987-12-01DOI: 10.1109/irmm.1987.9126986
A. McCurdy, C. Armstrong
Control of axial modes is accomplished in a gyrotron oscillator by injection of an external signal into the oscillator. It is found that the external signal need be present only during the initial stages of the pulsed oscillator buildup. It is also noted that the oscillation is not phase locked, due to the low input power level. From these two facts it is seen that priming is the mechanism responsible for the mode control effect. An analysis of the priming phenomenon is made using a quasi-linear theory (in the mode amplitudes) to understand the dependence of the degree of mode control on the external power level.
{"title":"Mode control in an overmoded gyrotron oscillator via priming","authors":"A. McCurdy, C. Armstrong","doi":"10.1109/irmm.1987.9126986","DOIUrl":"https://doi.org/10.1109/irmm.1987.9126986","url":null,"abstract":"Control of axial modes is accomplished in a gyrotron oscillator by injection of an external signal into the oscillator. It is found that the external signal need be present only during the initial stages of the pulsed oscillator buildup. It is also noted that the oscillation is not phase locked, due to the low input power level. From these two facts it is seen that priming is the mechanism responsible for the mode control effect. An analysis of the priming phenomenon is made using a quasi-linear theory (in the mode amplitudes) to understand the dependence of the degree of mode control on the external power level.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126402454","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}
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