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Volume 27, Issue 7
Displaying 1-12 of 12 articles from this issue
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Tadao TSURUTA1999 Volume 27 Issue 7 Pages 455
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (169K) -
Kenichi UEDA1999 Volume 27 Issue 7 Pages 456-457
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (341K) -
Mitsuru MUSHA, Ken'ichi NAKAGAWA, Kenichi UEDA1999 Volume 27 Issue 7 Pages 458-462
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSA high-power and highly-frequency-stabilized laser has been developed for the laser interferometric gravitational wave detector. Requirements of the light source for this are a single transverseand longitudinal mode with the power and frequency noise of 10W and 10-6Hz√Hz at 300 Hz, respectively. The frequency of a LD-pumped injection-locked Nd: YAG laser was stabilized to a high finesse Fabry-Perot optical resonator that was isolated from seismic and acoustic noise, which was achieved by controlling master laser light. We evaluated the mechanical and thermal stability of Fabry-Perot cavities of both rigid spacer type and the independently suspended mirrors type. Finally we have achieved the absolute frequency noise of2×10-2Hz/√ Hz for an injection-locked high-power laser with the output power of 9.8 W.View full abstractDownload PDF (1241K) -
Michio OKA, Yutaka IMAI, Naoya EGUCHI, Shigeo KUBOTA1999 Volume 27 Issue 7 Pages 463-468
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSNovel voice-coil-motors (VCM) are applied to an injection-locked Nd: YAG laser and a frequency quadrupled continuous-wave Nd: YAG laser. The injection locked laser is developed for TAMA300 interferometric gravitational wave detection. Using multi-rod laser design and the injection-locking technique, we achieved 10 W output power and single frequency lasing simultaneously. This laser is frequency-stabilized to a highfinesse Fabry-Pérot cavity. We have achieved long term reliability, low noise output and stable locking in external resonant frequency doubling of a beta-Barium Borate (BBO) cavity by the use of a novel VCM actuator and high quality Czochralski-grown BBO.View full abstractDownload PDF (1073K) -
1999 Volume 27 Issue 7 Pages 468-468,472
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (703K) -
Koji YASUI, Susumu KONNO, Tetsuo KOJIMA, Schuichi FUJIKAWA1999 Volume 27 Issue 7 Pages 469-472
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSOutput stability and noise-reduction for high-brightness solid-state lasers have been discussed. Unstable operations of rod-geometry solid-state lasers are analyzed by using wave-optics calculations considering polarization-dependent bifocusing of solid-state rods. It is shown that multiple-stability zones of resonators lead to unstable and noisy operation and bifocusing compensation could ensure stable and low-noise operations.View full abstractDownload PDF (746K) -
Hakaru MIZOGUCHI, Tatsuo ENAMI, Toshihiro NISHISAKA, Hirokazu TANAKA, ...1999 Volume 27 Issue 7 Pages 473-478
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSThe latest technologies of highly energy-stabilized and narrow band excimer lasers for lithography are introduced. New RF preionization scheme, solid state pulsed power technology realize high stability of pulse energy. The wavelength is stabilized by high precision measurement technology of deep-UV light. Other spectral properties are stabilized by improvement of optical components and stabilization of optical system. The performance and durability extension test which aimed reduction of CoO (Cost of Operation) of KrF excimer laser KLES-G10K up to 7 billion pulses are reported. Further performance of next generation KrF excimer laser; KLES-G20K is introduced. Furthermore, durability test data of latest ArF excimer laser for less than 0.15 μm lithography; KLES-G10A is reported. It proved experimentally the ability of ArF excimer lasers for semiconductor mass production. Also recent trend of F2 laser is reported. Future directio and issues of light source development in DUV-VUV are also discussed.View full abstractDownload PDF (1663K) -
Minoru YAMADA1999 Volume 27 Issue 7 Pages 479-483
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSGenerating mechanism of the optical feedback noise in semiconductor lasers and whose suppressing manner by utilizing the self-pulsation laser or the high frequency superposition method are theoretically reviewed. Those mechanisms are characterized in terms of the mode competition phenomena among the internal cavity modes of the solitary laser and the external cavity modes which are built up by the optical feedback. Suppression of the feedback noise is understood as an effect to shift the operating point to more stable state by help of the modulated photons and electron densities in the laser.View full abstractDownload PDF (901K) -
Satoru OKADA, Tsuyoshi FUJIMOTO, Yumi YAMADA, Yoshikazu YAMADA, Atsush ...1999 Volume 27 Issue 7 Pages 484-489
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSA new design of a real-index-guided Distributed Feedback Laser Diode (DFB-LD) based on a Decoupled Confinement Heterostructure (DCH) has been proposed and characteristics of a high power single longitudinal and lateral mode operation have been investigated. A grating was located at the interface under current blocking layer embedded in GaAs waveguide, so that current injection path was kept free from contamination during fabrication processes. A single longitudinal and lateral mode operation up to 400 mW has been achieved at 25°C, CW condition. Oscillation wavelength was around 978 nm and its temperature dependence was 0.087 nm/K. With increasing output power, oscillating longitudinal mode shifts moderately (0.0023 nm/mW) to longer wavelength undergoing a few mode hops. Specific features of DCH such as low thermal and electrical resistance and low gain coupling coefficient may contribute to suppression of thermal disturbance and hole-burning effect, and thus lead to an extremely high power single mode operation.View full abstractDownload PDF (1314K) -
Masato Yoshida, Koichiro NAKAMURA, Hiromasa ITO1999 Volume 27 Issue 7 Pages 490-494
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSIn the frequency-shifted feedback laser (FSF laser), a frequency shift is imposed on an intracavity light field by feedback of the first order diffracted light of an acousto-optic modulator (AOM). Here we report the first observation of a chirped frequency comb output from this type of laser with erbium-doped fiberas a gain medium, and investigate its application to optical reflectometry. The spatial resolution is demonstrated to be 1.5 mm.View full abstractDownload PDF (742K) -
Hidetsugu YOSHIDA, Hisanori FUJITA, Masahiro NAKATSUKA, Kunio YOSHIDA1999 Volume 27 Issue 7 Pages 495-500
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSStimulated Brillouin scattering (SBS) reflectivity and gain coefficient of bulk optical glasses, a laser glass and a fused-silica glass are measured at wavelength of 1.06μm. The reason why optical glass has ahigh damage threshold at long Q-switched pulse operation is explained in terms of the SBS backward reflectance. A flint glass of SF-6 has high SBS gain compared with the gaseous or liquid materials. Fused-silica glasses are most promissing as a phase conjugated SBS mirror for all solid-state high-energy lasers because of high damage threshold and their low absorbance.View full abstractDownload PDF (1125K) -
Masaru FUKUSHIMA, Yoshio TASHIRO, Kanji TANAKA, Satoshi KOYANAGI1999 Volume 27 Issue 7 Pages 501-505
Published: July 15, 1999
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSThis paper describes a 1.5-W signal output power Erbium Doped Fiber Amplifier (EDFA) employinga threechannel wavelength division-multiplexing technique with wavelength stabilized 1480 nm pump lasers by Fiber Bragg Grating (FBG) as an external cavity. The power conversion efficiency of total launched pump power to output signal power was 59% and the slope efficiency was 72%. We achieved more than 1 watt outputs over a 30 nm of signal wavelength range. The structure and recent data of high-power 1480 nm laser modules with FBG are introduced. We show the latest demonstration of a low loss (>0.9dB) 7.5 nm-spacing eightwavelength PLC (Planar Lightwave Circuit) -MZI (Mach-Zehnder Interferometer) multiplexer for 1480 nm band high-power pumping unit.View full abstractDownload PDF (1054K)
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