The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 27, Issue 2
Displaying 1-12 of 12 articles from this issue
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  • [title in Japanese]
    Junichi MIZUI
    1999 Volume 27 Issue 2 Pages 75
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.75
    JOURNAL FREE ACCESS
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  • On the Topical Papers of Adaptive Optics and Phase Conjugation Technologies
    Tadashi ARUGA
    1999 Volume 27 Issue 2 Pages 76-77
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.76
    JOURNAL FREE ACCESS
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  • Adaptive Optics and its Application to Astronomy
    Francois J. RODDIER
    1999 Volume 27 Issue 2 Pages 78-83
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.78
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    Adaptive optics is now routinely used on a growing number of optical telescopes for the real-time compensationof atmospherically-induced aberrations. After a brief historical account, current technology is described. Thelimitations of the technique are reviewed. An example is given of the performance one can now achieve. Astronomical applications are summarized.
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  • Adaptive Optics for High Power Lasers
    Kenichi UEDA
    1999 Volume 27 Issue 2 Pages 84-88
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.84
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    Adaptive optics systems for high power gas lasers and solid state lasers are reviewed. Large scale deformablemirrors with magnetostrict actuators were cooled by water for use with huge output infrared lasers. The simplemirrors which are deformable by the hydro pressure were applied to adaptive resonators for thermal lenscompensation with solid state lasers. A silicon wafer mirror was proposed as an automatic adaptive resonatorfor LD-pumped YAG lasers. New techniques employing a spatial phase modulator, phase-conjugated mirrors, and hybrid laser crystals are introduced.
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  • Optical Phase Conjugation and Image Reconstruction
    Huitian WANG
    1999 Volume 27 Issue 2 Pages 89-94
    Published: February 15, 1999
    Released on J-STAGE: August 04, 2010
    DOIhttps://doi.org/10.2184/lsj.27.89
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    We review the concept and generation methods of phase conjugate waves. They are particularly emphasizedon optical phase conjugation with the photorefractive effects. Applications of phase conjugation are describedand methods of distorted image reconstruction in one-way image transmission, using both phase conjugationand photorefractive incoherent-to-coherent conversion techniques, are highlighted.
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  • Recent Progress of Stimulated-Brillouin-Scattering Phase Conjugation Mirrors for High-Power Laser System
    Hidetsugu YOSHIDA, Masahiro NAKATSUKA
    1999 Volume 27 Issue 2 Pages 95-103
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.95
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    A phase conjugation mirror with stimulated Brillouin scattering (SBS-PCM) is useful to compensate for thewavefront distortion due to thermally-induced aberration and depolarization of average power that occurs withsolid state lasers. Use of the SBS-PCM is a promising approach toward power scaling of the solid-state laser. The basic properties of SBS materials are summarized, and several applications are reviewed.
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  • Wave Front Correction Characteristic of Adaptive Optics System Available in Vacuum and High Temperature Environments
    Yoshibumi MINOWA, Tomonori ISHII, Masaki TABATA, Keisuke YOSHIOKA, Hir ...
    1999 Volume 27 Issue 2 Pages 104-109
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.104
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    We have developed a wave front correction system for use in vacuum and high temperature environments. The sensor is a Shack-Hartman type composed of afocal system and 10×14 micro lens array designed athermaly, and a commercial CCD camera. The measurement error of the wave front was less than 1/10λ rms in atemperature range from 20°C to 60°C in a vacuum environment. The deformable mirror is composed of an 84×84 mm mirror, 5×5 PZT actuators, and hinges connected by a bonds designed for use in high temperatureand vacuum environments. The wave front acurracy was 1/10λ rms in the region of ±5λ and the 3rd ordermode in a vaccum of -1.3×10-4 Pa and a temperature of range from 26°C to 60°C. The control band of the system was 1 Hz. The characteristics of this system were measured and evaluated by using a 200 W level dyelaser beam of 35×50 mm, and wave front warps of about 4λ p-v were corrected to 0.1λ p-v within a time of 1 sec.
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  • Negative Nonlinear Absorption Effect in Glasses Containing High Concentrations of Erbium
    Yoshinobu MAEDA, Akio KONISHI, Hidekazu HASHIMA, Hajimu WAKABAYASHI, T ...
    1999 Volume 27 Issue 2 Pages 110-115
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.110
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    The dependence of the negative nonlinear absorption effect on both the modulation degree and frequency ofthe incident laser was investigated in heavily erbium-doped phosphate, borate, and fluoride glasses using a 809.2-nm laser diode. With decreases in the degree of modulation, reversed-phase waveforms were obtainedin the transmitted waveform. The modulation degrees were approximately 7, 14, and 32% for phosphate, borate, and fluoride glasses, respectively. For phosphate glass, the transmitted waveform changed to theopposite phase of the incident waveform at modulation frequencies from 0.25 to 1 MHz. For fluoride glass, however, the transmitted waveform was asymmetrical with decreasing modulation frequency. Thoseresultssuggest that the negative nonlinear absorption effect can be explained by an enhanced absorption, in which theamount of absorption increases due to the increase in incident laser intensity.
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  • Measurement of Optical Characteristics for Mirrors of the Gravitational Wave Detection Antenna
    Akitoshi UEDA, Kenichi UEDA, Shuichi SATO, Shinji MIYOKI, Masatake OHA ...
    1999 Volume 27 Issue 2 Pages 116-120
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.116
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    We measured the optical characteristics of ultra low-loss and high reflectance mirrors. Reflectance was evaluatedby means of finesse measurement using the ring down method. The mirrors show a loss of 4.8 ppm and finesseof nearly equal to 105. Surface distribution of reflectance was measured for ultra-high quality mirrors fabricatedwith a RF-type Ion Beam Sputtering machine. The average reflectance was 99.9915% with a standard deviationof 8 ppm. The measured area was 5×5 mm by step of 0.5 mm. Two-dimensional mapping of mirror loss wasmeasured for the mirrors of a 20 m gravitational wave detection antenna using small laser spot. The mirrorloss coefficient was evaluated based on the transmission efficiency of the Fabry-Pérot cavity. The measuredarea was 7.5×5 mm. The average loss value was 40 ppm for the small laser spot measurement. The mirrorloss coefficient for a large beam was measured using a 20 m Fabry-Pérot cavity. The mirrors show a loss of 28ppm and a reflectance of 99.9875%.
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  • Characteristics between Injection Current and Optical Power of Strained-Layer Multiple Quantum Well Semiconductor Lasers Coupled to an Externally Distributed Fiber Bragg Grating Reflector
    Hideyuki NASU, Hideyuki OMURA
    1999 Volume 27 Issue 2 Pages 121-126
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.121
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    For the first time, the effects of coupling efficiency and Fiber Bragg Grating (FBG) reflectivity to characteristicsbetween injection current and optical power of Strained-Layer Multiple Quantum Well (SL MQW) semiconductor lasers coupled to an externally distributed FBG reflector are demonstrated. In this paper, wedescribe the experimental and simulated results. Our simulations show good agreement with experimentalmeasurements. This kind of laser is investigated and demonstrated, since the lasing wavelengthcan bespecified by choosing Bragg wavelength of FBGs and also be stabilized. At present, 980 nm pumplasers usinga distributed FBG reflector are deployed to enhance stability of Erbium Doped Fiber Amplifiers (EDFAs).Furthermore, the potential for use in Wavelength Division Multiplexing (WDM) transmitters is investigated.This result is useful to design characteristics between injection current and optical power for such lasers. Weconclude that the optimum FBG reflectivity is 0.2 on our experimental configuration where couplingefficiency is 0.6.
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  • Test Operation of Jet-Type Singlet Oxygen Generator at Sub-Sonic Type Chemical Oxygen Iodine Laser
    Fumito KITATANI, Kaniti FUJII
    1999 Volume 27 Issue 2 Pages 127-129
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.127
    JOURNAL FREE ACCESS
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    A jet-type singlet oxygen generator (jet-type SOG) shows high efficiency in yielding singlet oxygen (O2 (1Δ)) at higher pressures. Generally, The jet-type SOG is employed in the super-sonic type COIL. In this paper, wereport the experimental result of operating a jet-type SOG in a table top sub-sonic COIL. Under our operatingconditions, the yield of O2 (1Δ) by a jet-type SOG was less than about 1/10 of the yield of the ordinary bubblertypeSOG. From this result, the bubbler-type SOG is considered to be suitable for a sub-sonic type COIL sinceit has the merit of easy handling when compared to the jet-type SOG.
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  • Fundamentals of Nonlinear Optics II: Second-and Third-Order Phenomena
    Tatsuo YAJIMA
    1999 Volume 27 Issue 2 Pages 130-138
    Published: February 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.130
    JOURNAL FREE ACCESS
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