The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 18, Issue 10
Displaying 1-11 of 11 articles from this issue
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  • [title in Japanese]
    Hiroshi KASHIWAGI
    1990 Volume 18 Issue 10 Pages 781
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.781
    JOURNAL FREE ACCESS
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  • Wavelength Stabilization of a Semiconductdor Laser by Using an Atomic Absorption Line
    Takashi SATO
    1990 Volume 18 Issue 10 Pages 782-788
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.782
    JOURNAL FREE ACCESS
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    This paper reviews the oscillation wavelength stabilization of a semiconductor laser using an atomic absorption line that is an accurate and stable wavelength reference. The strong absorption lines of cesium and rubidium atoms have been used as wavelength references for semiconductor laser wavelength stabilization because these lines are in the oscillation wavelength range of a semiconductor laser. A saturated absorption spectroscopy method has been applied to the stabilization because it provides a narrow Doppler free absorption spectrum as the wavelength reference. Wavelength stabilization under high speed modulation is required for coherent optical communication. On the other hand, wavelength stabilization without any frequency modulation is required for application fields which need a narrow oscillation linewidth. The wavelength stabilization using an atomic absorption line satisfies these requirements by using some control electronic circuits and/or magneto-optic effects, i.e., the Zeeman and the Faraday effects.
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  • Application of the Laser Light Scattering Method to the Investigation of Combustion
    Kunio TERAO
    1990 Volume 18 Issue 10 Pages 789-797
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.789
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    Observing the laser beam scattered by charged particles, the temperatures of the free electrons and ions as well as the electron density in the gases in a propagating flame, behind shock waves or behind detonation waves were measured. The method and results were explained, in which both the temperatures in the all cases were much higher than the average gas temperature, The heterogeneity and nonequilibrium states in the irreversible phenomena were thus confirmed by this metho.
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  • Preparations of Superconducting Oxide Films by CO2 Laser Physical Vapor Deposition
    Seigo HIRAMOTO, Takeshi MORITA, Kazuhiro OKA
    1990 Volume 18 Issue 10 Pages 798-805
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.798
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    Superconducting films of Y-Ba-Cu-O were produced by a CO2 laser evaporation technique based on a multi-layer deposition process using a multi-target (Y2O3 and Ba-Cu-O). The average deposition rate reached typically 10 nm/s. The film exhibited the superconductive transition at 85K after annealing in oxygen at 1200K. The presence of a small-particle deposition was found to influence the character of the multi-layered films. The influences of process parameters on morphology and superconductivity of the films were discussed.
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  • Processing of Glass Micro-Lens by a Laser Ion-Exchange Method
    Shigenori MATSUI, Kaoru SUZUKI, Tetsuya TANIYAMA, Junji NAKATA, Takaya ...
    1990 Volume 18 Issue 10 Pages 806-813
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.806
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    We have developed a micro-lens processing technique by “laser ion-exchange”. The lens was produced on a soda-lime glass plate by CO2 laser beam irradiation. This technique is based on the annealing on the irradiated surface and the ion-exchange at the bottom. Conclusions are as follows. (1) This technique is capable of producing a micro-lens having a short focal distance on a glass plate without marked distortion on the contour except for the inside. (2) The focal distance of the lens is reduced by increasing the shot-number of a laser. (3) At the bottom surface of the glass plate irradiated with a laser, ion-exchange between K+ and Na+ was observed with an electron probe X-ray micro analyzer.
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  • Damage Mechanisms and Characteristics of the Cavity Reflectors Damage Mechanisms and Characteristics of the Cavity Reflectors
    Yasuo TAKIGAWA, Kou KUROSAWA, Masahiro OKUDA, Wataru SASAKI, Kunio YOS ...
    1990 Volume 18 Issue 10 Pages 814-822
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.814
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    For high-power outputs from rare-gas excimer lasers, cavity reflectors having high reflectivity and free from radiation damage areprimarily required. We measure reflectivities and surface topographic features for some reflectors made of Alfilms deposited on SiO2 substrates, SiC films deposited on graphite substrates, SiO2 glasses, and single crystals of W, Mo, Si and Cr. The results of surface damageobserved on Al and Si mirrors as well as a thermodynamical calculation show that the surface damage is caused mainly by surfacemelting due to strong absorption of laser energy.
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  • Analysis on Inverse Free-Electron Laser Accelerator
    Nobuhisa OHIGASHI, Kunioki MIMA, Katsuhiro OHI, Shin-ichiro KURUMA, Yo ...
    1990 Volume 18 Issue 10 Pages 823-833
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.823
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    The characteristics of the accelerator using the inverse free-electron laser process are investigated by a 1-D FEL simulation code in order to demonstrate the potential of this type of accelerator. When an infrared laser of 60 GW is focused to a 280μm diameter laser spot, the maximum acceleration rate reaches 100 MeV/m and the accelerated electron beam is strongly bunched. The bunch length is about 1/14 of the laser wavelength. For the simulations using the spectrum with sideband components, an unstable phenomenon is found which is due to the resonance between the synchrotron motion and the beat frequencies of the broad band laser radiation. The energy losses by the higher harmonics and by the synchrotron radiation are also studied.
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  • Bio-stimulation Responses Caused by Low Energy Laser Irradiation
    Osamu FUJIWARA, Hiroyuki TAKEMOTO, Takashi AZAKAMI
    1990 Volume 18 Issue 10 Pages 834-839
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.834
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    Bio-stimulation therapy using a low energy laser is called laser acupuncture. In parallel with the development of a semiconductor laser technology, the clinical investigations of the laser acupuncture have actively been conducted, revealing many kinds of beneficial effects, though these action mechanisms are not well elucidated. In studying the mechanisms, it is indispensable to quantitatively grasp the relationships between the laser beam irradiation and its bio-stimulation responses. For this purpose, measurements were carried out on pulse-intervals at subject's index finger-tip irradiated with a GaAs semiconductor laser of 30 mW. A sophisticated method was also presented for identifying the small consistent changes statistically. As a result, we found that the laser acupuncture can accelerate the elapsed-time fluctuations of the pulse-intervals and also that fluctuation levels differ depending on the irradiation time.
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  • Report on 2nd Workshop of KrF Laser Technologies
    Fumihiko KANNARI
    1990 Volume 18 Issue 10 Pages 840-845
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.840
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  • Erratum
    1990 Volume 18 Issue 10 Pages 853
    Published: 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.10_853
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1990 Volume 18 Issue 10 Pages plate1-plate2
    Published: October 29, 1990
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.2184/lsj.18.10_plate1
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