Journal of Infrared, Millimeter, and Terahertz Waves

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Study of the Polarization Strategy for Electron Cyclotron Heating Systems on HL-2M
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 37 - Trang 572-581 - 2016
F. Zhang, M. Huang, D. H. Xia, S. D. Song, J. Q. Wang, B. Huang, H. Wang
As important components integrated in transmission lines of electron cyclotron heating systems, polarizers are mainly used to obtain the desired polarization for highly efficient coupling between electron cyclotron waves and plasma. The polarization strategy for 105-GHz electron cyclotron heating systems of HL-2M tokamak is studied in this paper. Considering the polarizers need high efficiency, st...... hiện toàn bộ
Parametric Simulation and Optimization of Cold-test Properties for a 220 GHz Broadband Folded Waveguide Traveling-wave Tube
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 30 Số 9 - Trang 945-958 - 2009
Ruilin Zheng, Xuyuan Chen
THz Time-Domain Spectroscopic Imaging of Human Articular Cartilage
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 33 - Trang 593-598 - 2012
Euna Jung, Hongkyu Park, Kiwon Moon, Meehyun Lim, Youngwoong Do, Haewook Han, Hyuck Jae Choi, Byung-Hyun Min, Sangin Kim, Ikmo Park, Hanjo Lim
Mid-infrared Frequency Comb Spanning an Octave Based on an Er Fiber Laser and Difference-Frequency Generation
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 33 - Trang 479-484 - 2012
Fritz Keilmann, Sergiu Amarie
We describe a coherent mid-infrared continuum source with 700 cm-1 usable bandwidth, readily tuned within 600–2500 cm-1 (4–17 μm) and thus covering much of the infrared "fingerprint" molecular vibration region. It is based on nonlinear frequency conversion in GaSe using a compact commercial 100-fs-pulsed Er fiber laser system providing two amplified near-infrared beams, one of them broadened by a ...... hiện toàn bộ
Development of Short Electrical Pulses in a Schottky Line Periodically Loaded with Resonant Tunneling Diodes
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 33 - Trang 627-637 - 2012
B. Z. Essimbi, D. Jäger
The characteristics of a Schottky line periodically loaded with resonant tunneling diodes (RTDs) are discussed for the development of short electrical pulses. RTDs act as electronic switches and exhibit a pronounced N-shaped I-V characteristic even at millimetre wave frequencies. The dynamics of the line is reduced to an extended KdV equation. These dynamics are considered both within the method o...... hiện toàn bộ
Measurements of the Polarization Properties of Foam Materials Useful for mm-wave Polarimeters Windows
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 37 - Trang 815-824 - 2016
G. Coppi, T. Marchetti, P. de Bernardis, S. Masi
We have measured in the W-band, using a custom setup, the absorption and polarization properties in transmission of foam materials (elyfoamⓇ, styrodurⓇ, plastazoteⓇ, and propozoteⓇ) useful for windows of mm-wave photometers and polarimeters. The levels of the induced polarization degree and of the absorption are very small, and difficult to measure accurately. We find induced polarization degrees ...... hiện toàn bộ
A Scanning-Free Terahertz Frequency Domain Spectroscopy
Journal of Infrared, Millimeter, and Terahertz Waves - - Trang 1-10 - 2023
Yu Qin, Mingrui Zou, Zeyu Li, Qiang Yan, Xun Zhou, Weipeng Kong
Frequency domain terahertz spectroscopy usually requires frequency scanning, which is quite time-consuming. In this work, we propose a new method to measure the terahertz spectra without scanning, which is based on a terahertz parametric generator and up-conversion detection system. Comparison is made between the terahertz transmission spectra measured by this method and by terahertz time domain s...... hiện toàn bộ
Saturation and Polarization Characteristics of 1.56 μm Optical Probe Pulses in a LTG-GaAs Photoconductive Antenna Terahertz Detector
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 34 - Trang 423-430 - 2013
Elmer S. Estacio, Masakazu Hibi, Katsuya Saito, Christopher T. Que, Takashi Furuya, Fumiaki Miyamaru, Seizi Nishizawa, Kohji Yamamoto, Masahiko Tani
The characteristics of low temperature-grown GaAs photoconductive antenna (PCA) terahertz detectors probed by 1.56 μm laser pulses are investigated. The influence of TM and TE polarized probe, as well as the saturation characteristics are studied for 2 μm- and 5 μm-gap PCA’s. Different polarization characteristics at low probe powers and at the saturation regimes were observed. Results are explain...... hiện toàn bộ
Development of a Chaff Cloud RCS Measurement Radar at 94.5 GHz
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 31 - Trang 1390-1397 - 2010
Lin Zou, Xuegang Wang, Lu Qian
The Radar Cross Section (RCS) signature of the chaff cloud in the millimeter wave band is useful in many research fields such as radar countermeasure, target identification and discrimination, and so on. To obtain the RCS of the chaff cloud, practical measurement is an effective method. This paper introduces the design and implementation of a bistatic radar which is used for chaff cloud RCS measur...... hiện toàn bộ
Discovery of Optically Pumped Far-infrared Laser Emissions from Formic Acid and its Isotopologues
Journal of Infrared, Millimeter, and Terahertz Waves - - 2014
K. Olivier, B. DeShano, B. Cain, L. R. Zink, M. Jackson
An optically pumped molecular laser system with a transverse excitation scheme has been used to generate far-infrared radiation. Over 100 laser emissions with wavelengths up to 1.03 mm have been detected with this system using formic acid and several of its isotopologues. This includes ten new laser lines which are reported with their operating pressure, power, polarization with respect to the CO2...... hiện toàn bộ
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