The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 21, Issue 3
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Hiroyuki SUGAWARA
    1993 Volume 21 Issue 3 Pages 351
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_351
    JOURNAL FREE ACCESS
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  • Terawatt Class Ti : sapphire Laser
    Kiminori KONDO, Nobuhiko SARUKURA, Kazuaki SAJIKI, Shuntaro WATANABE
    1993 Volume 21 Issue 3 Pages 352-359
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_352
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    A Ti : sapphire laser is a tunable, high power, ultrashort laser which can be applied to various researches such as high-order harmonic generation, hot dense plasma generation etc. The recent results of Ti : sapphire and Cr : LiSAF were summarized. The details of a Ti : sapphire laser system, which is now being developed in our instiute, is described with the preliminary results of harmonic generation.
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  • Optical Transmission Systems for Multi-Channel TV Signals
    Katsuyuki FUJITO, Hiroaki NAKATA, Masaru FUSE, Kazuki MAEDA
    1993 Volume 21 Issue 3 Pages 360-368
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_360
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    Analog optical transmission techniques are of increasing interest for multichannel TV signals because of their simple and economical configuration. In this report, various kind of analog optical transmission systems for FDM multi-channel TV signals and appropriate laser diode characteristics for analog direct intensity modulation are described.
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  • Recent Development of Compact Coherent Lidars
    Kin Pui CHAN
    1993 Volume 21 Issue 3 Pages 369-375
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_369
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    Coherent lidar is a powerful tool for three-dimensional wind measurement, atmospheric gases and chemical species monitoring, and target discrimination. Recent development of compact coherent lidars has led to systems that are portable for field measurements, and are well suited for airborne and future satellite-based measurements. This paper summarizes the development of a compact 2 μm Tm:YAG and a 10 μm CO2 coherent lidar at NOAA's Wave Propagation Laboratory. The recent experimental studies of the atmospheric turbulence effects on the near infrared coherent lidars are also reviewed.
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  • Comparison of the Cutting Performance of a CO and a CO2 Laser
    Hirotaka KANAZAWA, Naohito YAMAGUCHI, Yasunori HAMANO, Masahiro YUUKI, ...
    1993 Volume 21 Issue 3 Pages 376-386
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_376
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    Cutting performance for metals and ceramics with a CO laser (λ= 5-6 μm) was compared with that with a CO2 laser (λ = 10.6 μm). Comparative runs were conducted with keeping experimental conditions same for both lasers except for a laser wavelength, in order to investigate the effect of wavelength on the cutting performance. Workpiece materials used for the experiments were stainless steel, carbon steel, copper, aluminum alloy, alumina (Al2O3) and aluminum nitride (AlN). The cutting performance were compared in terms of the maximum cutting speeds at which the workpiece plate is cut and separated. The maximum cutting speeds by the CO laser were always higher than those with a CO2 laser when the plate thickness was relatively thin (<5mm). In particular a very large difference in cutting speed was observed for the aliminum alloy. On the other hand for thick plate O2 cutting with self-burning, an effect of assist gas was much larger than that of wavelength.
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  • Particle Formation by CO2 Laser-Induced Breakdown (II)
    Formation of B4C Fine Powder from Boron Bromide-Methane-Hydrogen System.
    Toshiyuki OYAMA, Masayoshi KOBAYASHI, Tadahiro ISHII, Kazuo TAKEUCHI, ...
    1993 Volume 21 Issue 3 Pages 387-391
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_387
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    Fine B4C powder was synthesized by the TEA-CO2 laser-induced dielectric gas breakdown of a BBr3 + CH4 + H2 gas mixture. The product was characterized by SEM, ICP atomic emission spectroscopy, and electron and X-ray diffractions. The particles show a narrow size distribution with a mean particle size of 0.18 μm. The yield of particles was increased linearly with increasing laser pulse energy. About 90% of incident pulse energy was absorbed by plasma in the reactant gas.
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  • Characteristics Measurement of Avalanche Photo-Diode Quadrant Detector for Dim Light Position Sensing
    Masahiro TOYODA, Hideki TAKAMI, Kenichi ARAKI, Tadashi ARUGA
    1993 Volume 21 Issue 3 Pages 392-398
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_392
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    Optical spot position sensing performance of a silicon APD-QD (Avalanche Photo-Diode Quadrant Detector) is presented. The APD-QD is useful for measuring low power laser or optical beam spot position, since the detector is more sensitive than a photo-diode-QD. We measured the cross talk between cells as well as fundamental charactaristics which are required for position sensing. Signal-to-noise ratio and noise equivalent power (NEP) are calculated using results of the nose spectral density measurement. The effects of the cooled APD-QD at 77K are also presented.
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  • Analysis of the Characteristics of Launching High Power YAG Laser Light into a Fiber by Means of Ray Matrices
    Hiroshi MIURA, Hiroo TAKENAKA, Kenichi ARAKI
    1993 Volume 21 Issue 3 Pages 399-408
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_399
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    In the experiments using incident optics which have been developed for launching high power YAG laser light into a fiber, the entrance portion of the fiber is overheated under some experimental conditions. In order to analize this overheat phenomena we propose expressions that the maximum laser power possible to launch into a fiber is limited by the core diameter and the NA (numerical aperture) of the fiber in terms of the maximum beam divergence angle αmax using ray matrices. The experimental αmax, above which overheating takes place was found to be larger than the calculated one by 15mrad. This difference suggested the existence of a cladding mode transmission in the fiber of the launching experiments. The experiments of cladding mode stripping proved the existence of this mode transmission. These calculations and experiments lead to a conclusion that the overheat of the fiber is attributed to the laser light escaping through the removed edge of silicon primary coat which refractive index is degraded by the heat of removal.
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  • Conference Report on SPIE's OE/LASE '93
    Masahiro NAKATSUKA, Yoshinori ARIMOTO, Hidenao TANAKA, Yoshiyasu MATSU ...
    1993 Volume 21 Issue 3 Pages 409-428
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_409
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1993 Volume 21 Issue 3 Pages i
    Published: March 29, 1993
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.21.3_i
    JOURNAL FREE ACCESS
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