Shigeo Kubota

Kawasaki Hospital

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An all-solid-state continuous-wave 266nm laser for optical disk mastering

Optical Data Storage (1998)

Michio Oka Minoru Takeda Toehiyuki Kashiwagi Masanobu Yamamoto Michibiko Sakamoto

Progress in short-wavelength laser diodes and near field techniques urges the development of ultra-high density disk mastering. Argon ion lasers have been the choice for the purpose. However, the lasers are inefficient and require water-cooling, which is not suitable feature due to induced vibration, moreover available wavelength for stable operation is limited to 351 nm.

10.1364/ods.1998.tua.2

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The β conformation of polypeptides of valine, isoleucine, and threonine in solution and solid‐state: Optical and infrared studies

Biopolymers (1975)

Shigeo Kubota Gerald D. Fasman

Abstract Water‐soluble polypeptides of L ‐valyl and L ‐isoleucyl residues flanked with DL ‐lysyl blocks [poly( DL Lys · HCl) x –poly( L Val) y –poly( DL Lys · HCl) x , poly( DL Lys · HCl) x –poly‐( L Ile) y –poly( DL Lys · HCl) x ] and homopoly( L ‐threonine) were prepared. The β conformation of these polymers in water, as well as in aqueous methanol, was confirmed by infrared spectroscopy and circular dichroism studies. The optical properties of these valyl and isoleucyl polypeptides were quite different from those of previously reported synthetic homopolypeptides in the β structure. Their differences could be explained by the presence of a “ single extended β chain ” without either intra ‐ or inter chain association.

10.1002/bip.1975.360140314

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Citations (46)

100% Conversion Efficiency from a Resonant External Doubler

Michio Oka Steven Yang Shigeo Kubota

By introducing gain medium to compensate for passive cavity loss inside an external resonant doubler, 100 % conversion efficiency from incident 1.06 μm fundamental wave to second harmonic output was demonstrated. Using this technique, 1.8 W cw single frequency 532 nm output was obtained from 1.8 W cw single frequency diode-end-pumped injection-locked Nd:YAG laser output with additional pump power of 3.6 W.

Frequency multiplier

Frequency Conversion

Voltage doubler

Harmonic

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A New Focus Servo Method for Magneto-Optical Disk Systems : DRIVE TECHNIQUE

Japanese Journal of Applied Physics (1987)

Michio Oka Atushi Fukumoto Kiyoshi Osato Shigeo Kubota

Optical disc

Servomechanism

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High-average-power, high-repetition-rate, injection-seeded 213 nm generation for optical microlithography

Shigeo Kubota Hisashi Masuda H. Kikuchi M. Oka Jason Alexander

Repetition (rhetorical device)

10.1109/cleo.1997.603520

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Citations (1)

Injection locking of intracavity SHG lasers

Y. Kaneda M. Oka Shigeo Kubota

A single-frequency laser source is attractive because nonlinear frequency conversion in an external resonator allows generation of shorter wavelengths approaching the ultraviolet region. In order to obtain an efficient and stable single-frequency green laser source, we proposed up to 100% output from the incident fundamental power to the second harmonic output by placing a "booster" within an externally resonant doubler. We extend this approach to obtain a higher SHG power than the fundamental input power. A similar experiment was previously performed at a lower power. We assume a unidirectional ring resonator Nd:YAG laser.

Frequency multiplier

Booster (rocketry)

Harmonic

10.1109/leos.1999.812003

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Thermal aberration analysis of a laser-diode-pumped Nd:YAG laser

Shigeo Kubota Michio Oka Yushi Kaneda Hisashi Masuda

A recently developed powerful GaAlAs laser diode has excellent spectral match to absorption band of NdzYAG crystal (808nm) and can provide end-pumping configuration where pump beam well overlaps with transverse resonator modes of YAG laser. These properties allow to build an efficient diode-pumped NdzYAG laser. 1 We have stabilized an intra-cavity frequency-doubled NdzYAG laser with a KTiOPO 4 (KTP) doubler using a quarter wave plate to decouple the polarization mode interaction inside the cavity. 2 With this technique, the green (532nm) laser can be used in a readout system of a tripled density optical disk. 3

Optical cavity

Optical Pumping

10.1364/ild.1990.ltha2

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93. The Study Quantitative Analysis of the Female Pelvis

日本産科婦人科學會雜誌 (1979)

T Koyanagi Hiroki Nakano Shigeo Kubota Chiaki SAKAMOTO

Source

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An electrodialysis sea water desalination system powered by photovoltaic cells

Desalination (1987)

Osamu Kuroda S. Takahashi Shigeo Kubota Kenji Kikuchi Y. Eguchi

10.1016/0011-9164(87)90229-3

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Citations (31)

Measurement and Analysis of Cavity Loss of a 266 nm Continuous-Wave Solid-State Laser

Japanese Journal of Applied Physics (2004)

Hiroyuki Wada Michio Oka Koichi Tatsuki Masaki Saito Shigeo Kubota

The effect of purge air on the reliability of a 266 nm continuous-wave (cw) solid-state laser was analyzed by measuring the cavity loss of an ultraviolet (UV) laser. The water content of the purge air strongly connected with the reliability of the laser. Irradiation by UV laser beam and existence of water around a mirror in an external cavity created scatterers on the surface of the mirror. The scatterers increased the cavity loss of the UV laser and markedly decreased the UV laser power.

Ultraviolet

Continuous wave

Solid surface

10.1143/jjap.43.l393

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Citations (2)