The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 18, Issue 6
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Kunihiko WASHIO
    1990 Volume 18 Issue 6 Pages 393-394
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_393
    JOURNAL FREE ACCESS
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  • Transient Gain Phenomena and Their Improvement in a Fast-Axial Flow CO2 Laser Amplifier
    Heihachi SATO, Eiichi TSUCHIDA
    1990 Volume 18 Issue 6 Pages 395-405
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_395
    JOURNAL FREE ACCESS
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    The present paper reviews our recent work on transient gain phenomena caused by both thermo & gas dynamic cooling mechanism and dissociation of CO2 molecules in a fast-axial flow (FAF) CO2 laser amplifier. Taking into account a time-dependent gas temperature T and an inverted population n2/n1, we theoretically formulate a transient gain as functions of the gas-flow velocity ν and the discharge current Idis including their spatial distributions along the radial direction from the plasma-tube axis to explain the transient power-decrease ΔP and the transient time tst required to be a stable value with respect to a plasma length l and an input probe power Pin Theoretical calculations are in good agreements with, corresponding experimental results. Possibilities for improving the above transient behavior are also demonstrated by cooling a plasma-tube wall and by use of an Au catalyst.
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  • Vacuum Ultraviolet Laser Induced Damage in Silica Glass
    Kou KUROSAWA, Yasuo TAKIGAWA, Wataru SASAKI, Masahiro OKUDA, Etsuo FUJ ...
    1990 Volume 18 Issue 6 Pages 406-414
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_406
    JOURNAL FREE ACCESS
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    An Ar (126nm) or a Kr (146nm) excimer laser, once used as a cavity reflector, has been found to cause serious surface damage-to silica glass. The damage was observed with an optical profilemeter and a selected-area X-ray photoelectron spectrometer. Transmission and reflectance spectra were also taken at the UVSOR facility. Si isolation in the surface layer is caused by Ar excimer laser irradiation, but not by Kr excimer laser irradiation. Excitons generated by Ar excimer laser photons via an efficient one photon process are considered to play a fundamental role inthe Si isolation.
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  • Measurement of Small Angular Displacements with a Flat-Parallel Glass Plate
    Akira SASAKI, Shigehiko MIZUNO, Akitoshi NOZAKI, Hisayuki AOYAMA
    1990 Volume 18 Issue 6 Pages 415-420
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_415
    JOURNAL FREE ACCESS
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    A new, simple method is presented for the accurate measurement of small angular displacements. An incident laser diode beam on a flat-parallel glass plate was reflected at the front and the rear surface of the plate, and the interference pattern of two reflected beams was measured with a one-dimensional image sensor and a microcomputer, After the running average of the interference pattern signals was computed numerically to reduce spatial noise on the interference pattern, interference peak positions and angular displacements were estimated. The small angular displacements thus obtained were found to be in approximate agreement with a theory.
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  • Band Selection and Output Prediction of a XeCl Laser
    Masaharu HYODO, Misao OHI
    1990 Volume 18 Issue 6 Pages 421-427
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_421
    JOURNAL FREE ACCESS
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    The 0-1 band selection of a XeC1 excimer laser was performed by using a solid etalon, with the aid of the OH absorption in the 0-2 band. Owing to the spectral width of the 0-1 band reduced to 13 pm and to the effectively reduced energy of the 0-2 band, brightness was increased by a factor of 13. The band selected output energy density, 11.0 mJ/cm2, is in good agreement with the value, 11.1 mJ/cm2, predicted from a simple model.
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  • Development of a High-Power Ultra-Short Pulse Excimer Laser in the Max-Planck-Institut
    Hakaru MIZOGUCHI
    1990 Volume 18 Issue 6 Pages 428-434
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_428
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    A high-power ultra-short pulse excimer laser is being developed in the Max-Planck Institut für biophysikalische Chemie Göttingen, Fed. Rep. Germany. This system consists of an excimer laser excited distributed feedback dye laser and large aperture KrF excimer amplifiers. A subterawatt femtosecond KrF excimer laser (150fs, 45mJ) system has been working reliably. AnX-ray preionized 100mm×100mm large aperture KrF excimer amplifier has been constracted successfully, by which the output power level of the system will be extended to the terawatt region.
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  • [title in Japanese]
    1990 Volume 18 Issue 6 Pages plate1
    Published: June 29, 1990
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.18.6_plate1
    JOURNAL FREE ACCESS
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