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
Design of a Dielectric Rod Waveguide Antenna Array for Millimeter Waves
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 38 - Trang 33-46 - 2016
Alejandro Rivera-Lavado, Luis-Enrique García-Muñoz, Andrey Generalov, Dmitri Lioubtchenko, Kerlos-Atia Abdalmalak, Sergio Llorente-Romano, Alejandro García-Lampérez, Daniel Segovia-Vargas, Antti V. Räisänen
In this manuscript, the use of dielectric rod waveguide (DRW) antennas in the millimeter and sub-millimeter wave range is presented as a solution for covering two issues: getting more radiated power and filling a technological gap problem in the terahertz band, namely a fully electronic beam steering. A 4x4 element array working at 100 GHz fed by a rectangular waveguide is manufactured and measure...... hiện toàn bộ
Prediction of the Thickness of a Thin Paint Film by Applying a Modified Partial-Least-Squares-1 Method to Data Obtained in Terahertz Reflectometry
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 34 - Trang 646-659 - 2013
Tetsuo Iwata, Shuji Yoshioka, Shota Nakamura, Yasuhiro Mizutani, Takeshi Yasui
We applied a multivariate analysis method to time-domain (TD) data obtained in terahertz (THz) reflectometry for predicting the thickness of a single-layered paint film deposited on a metal substrate. For prediction purposes, we built a calibration model from TD-THz waveforms obtained from films of different thicknesses but the same kind. Because each TD-THz wave is approximate by the superpositio...... hiện toàn bộ
The Progress in the Studies of Mode Interaction in Gyrotrons
Journal of Infrared, Millimeter, and Terahertz Waves - Tập 43 - Trang 1-47 - 2022
S. P. Sabchevski, M. Yu. Glyavin, G. S. Nusinovich
The studies on mode interaction in gyrotrons had always been an active field of research due to their theoretical and practical importance for better understanding of the underlying physical principles and the development and optimization of various gyro-devices. However, lately, the problems that stem from the mode interaction have become more pronounced and severe due to the recently demonstrate...... hiện toàn bộ
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