Yoshiki Miyake

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We have developed a conductively cooled, Q-switched 2 μm laser with a triangular-prism Tm,Ho:LLF rod. Using a fused-silica acousto-optic Q-switch, the laser produced an output energy of 30 mJ in a single Q-switched pulse at a pulse repetition frequency of 5 Hz. Although the laser rod had polished lateral surfaces, no parasitic oscillation occurred, even at(More)
A room temperature CW operation of Ga/sub 0.3/In/sub 0.7/As/GaInAsP/InP GRINSCH compressive strained MQW lasers with 30 approximately 60 nm wide wire active region was achieved. This device was fabricated by two-step LP-OMVPE growths on p-type InP substrate and wet chemical etching. Threshold current as low as 53 mA (L=910 mu m, J/sub th/=2.9 kA/cm/sup 2/)(More)
GaInAs-GaInAsP-InP SCH (separate-confinement heterostructure) multiquantum-film lasers with approximately 100-nm-wide wirelike active regions were fabricated by two-step low-pressure organometallic vapor-phase epitaxy (LP-OMVPE) growth and wet chemical etching and operated at room temperature. An increase in the threshold current density in such lasers was(More)
The temperature dependence of Q-switched performance of a Tm, Ho: YLF laser was investigated. Small-signal gains and output energies were measured at 193-246 K. A quasi-four-level nature strongly affected the laser performance even in this temperature range.
The threshold current of GaInAs/GaInAsP/InP separate confinement heterostructure (SCH) quantum-well lasers with narrow (70-160-nm) wirelike active regions, which were fabricated by two-step LP-OMVPE growths and wet chemical etching, was much reduced (<1 kA/cm/sup 2/) by using p-type InP substrates. This result indicates the importance of eliminating the p-n(More)
In this paper soft magnetic FeCo films were electrodeposited in two different electroplating baths with pulse current, one contained NaCl, the other contained KCl as electroconductivity investor. This however, have slightly lower B/sub s/ than that of the sputtered film. One of the reasons for the lower B/sub s/ is thought to be the effect of impurities. In(More)
Perceived brightness is considered to be a combined consequence of outputs of the luminance channel and the chromatic channels in the visual system. The differences of logarithmic spectral luminous efficiencies between heterochromatic brightness matching and flicker photometry that were obtained from 16 subjects were examined by using principal component(More)
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