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We report on the method that terahertz generation and detection were simultaneously performed via non-collinear optical parametric interaction in a nonlinear crystals using a Si-photodiode. The bandwidth manipulation between broad 3.3 THz and narrow 45GHz bandwidths was demonstrated at single quasi-phase-matching crystal using the position-dependence of the crystal.
Conversion from static electric fields to periodic terahertz waves has been experimentally demonstrated at 0.38THz using an optically controlled array of coplanar strip lines on a semi-insulator GaAs substrate.
A dual-frequency laser coupled to a unitravelling carrier photodiode is used to produce a highly coherent THz wave. THz signal is detected by a subharmonic mixer coupled to an electrical spectrum analyzer. All components involved in this experiment operate at room temperature and no active stabilization is used. The measured linewidth is better than 30 kHz and tunable from DC to 1 THz. The dynamic...
Diffractive optical elements (polypropylene kinoform diffractive lenses, silicon binary diffractive lenses, and silicon beamsplitters) for the terahertz spectral range have been designed and characterized using high-power terahertz radiation of Novosibirsk free electron laser. The effect of an antireflection coating on the silicon elements was studied.
A Mid-infrared Free-Electron Laser (MIR-FEL) facility named as KU-FEL (Kyoto University FEL) has been developed in Institute of Advanced Energy, Kyoto University. The facility aims at utilizing MIR-FEL to various energy related sciences, such as material, biological and chemical sciences. The present status, performance and result of demonstration experiment are reported in this paper.
Achieving absolute power measurement is not so easy in the THz range. In this paper, we describe a simple method to perform power measurement no more expressed in a.u. but in Watt. For a 3.8 THz single-plasmon Quantum Cascade Laser, 28.8 mW peak power was measured with 12:1% relative uncertainty. The operating method described is not really a metrologic one but one that can be easily performed in...
Start-to-end calculation has been performed to estimate the performance of the THz FEL system using a photocathode RF gun which will be installed to existing MIR-FEL (KU-FEL) system at Institute of Advanced Energy, Kyoto University. The aim of this system is a test bench to realize the table-top THz system. The electron beam properties have been evaluated from the photocathode RF gun to the entrance...
A low-cost ultra-thin broadband terahertz beam-splitter based on a thin conductive layer has previously been fabricated and tested. Here, this paper shows the linearity of power scaling of the beam-splitter from lower to higher power in typical terahertz time-domain spectroscopy systems. The presented results consider multiple samples of differing thicknesses.
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