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Band gap shrinkage in GaInAs/GaInAsP/InP multi-quantum well lasers
Park, S. H.,Shim, J. I.,Kudo, K.,Asada, M.,Arai, S. 대구효성가톨릭대학교 자연과학연구소 1992 基礎科學硏究論集 Vol.1992 No.1
We investigated a band gap shrinkage in both lattice-matched and compressive strained GaInAs/GaInAsP/InP multi-quantum well lasers. The band gap shrinkage is obtained from the broadening of the low energy side in the spectrum by considering effects of an intraband scattering and a fundamental band edge. It amounts to 20-25 meV at sheet carrier densities of above 10^12 ㎝^-2, and shows n^1/1.3 dependence at low carrier densities and n^1/3 dependence at higher densities. These dependencies agree well with theoretical predictions in the quantum well.
S.Kondo,H.Nakagawa,T.Saito,H.Asada 한국물리학회 2004 Current Applied Physics Vol.4 No.5
The compounds CsPbCl3 and CsPbBr3, which are known to be one of the most luminescent semiconductors, show enhancedphotoluminescence for thin lms prepared by crystallization from the amorphous phase into microcrystalline/polycrystalline states.The microcrystalline state shows more than an order of magnitude stronger free-exciton emission than the polycrystalline state, aswell as than bulk single crystal.A possible explanation for this phenomenon is given in terms of excitonic superradiance.The extreme radiance of the thin-lm samples is fascinating when considering application in opto-electronic micro-devices.
S. Kondo,T. Nakanish,T. Saito,H. Nakagawa,H. Asada,K. Takahashi 한국물리학회 2007 Current Applied Physics Vol.7 No.1
Photoluminescence of microcrystalline CsPbBr3 lms grown from the amorphous phase shows stimulated emission not only at cryo-3 single crystals, where no stimulated emis-sion occurs even at 4.2 K. This is the rst demonstration of room temperature stimulated emission from metal halide compounds.The stimulated emission is so strong that single-path-light-amplication stimulated emission across the lm thickness is observed atrelatively low threshold excitation intensities of. 50 kW cm. 2 at 77 K and . 100 kW cm. 2 at 295 K suggesting a large optical gain. Theattributable to giant oscillator strength eect characteristic of excitonic superradiance recently reported in this issue.
Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA
Akiyama, Y,Akutsu, T,Ando, M,Arai, K,Arai, Y,Araki, S,Araya, A,Aritomi, N,Asada, H,Aso, Y,Bae, S,Baiotti, L,Barton, M A,Cannon, K,Capocasa, E,Chen, C-S,Chiu, T-W,Cho, K,Chu, Y-K,Craig, K,Dattilo, V,Do Institute of Physics 2019 Classical and quantum gravity Vol.36 No.9
<P>A vibration isolation system called the Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics.</P>