The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
Volume 13, Issue 5
Displaying 1-7 of 7 articles from this issue
  • Shigeo SHIONOYA
    1985 Volume 13 Issue 5 Pages 395-397
    Published: May 28, 1985
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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  • Godfrey SAXON
    1985 Volume 13 Issue 5 Pages 398-407
    Published: May 28, 1985
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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  • Chun Lin SHAO, Takashi JIMBO, Masayoshi UMENO, Shuzo HATTORI
    1985 Volume 13 Issue 5 Pages 408-415
    Published: May 28, 1985
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
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  • Motoichi OHTSU, Yoshihiro OTSUKA, Akio OSAKI, Yasuaki TERAMACHI
    1985 Volume 13 Issue 5 Pages 416-425
    Published: May 28, 1985
    Released on J-STAGE: July 30, 2010
    JOURNAL FREE ACCESS
    Experiments and analog computer simulations were carried out to analyze the characteristics of mode hopping phenomenon in a 1.5μm In Ga As P laser when it oscillated with two longitudinal modes. It becomes clear for the first time that intensity fluctuation of the spontaneous emission acts as a trigger to the mode hopping, and that this hopping follows the stochastics of a Poisson process. Furthermore, it was found that highly biased operation is effective to reduce the frequency of the mode hopping.
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  • Katsushi KITAGAWA
    1985 Volume 13 Issue 5 Pages 426-431
    Published: May 28, 1985
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    Small signal gain of a throat mixing gasdynamic laser was measured. This mixing GDL was driven by decomposed gas of liquid N2O and mixed with liquid CO2 at the throat of a screen nozzle. The maximum gain of 0.42%/cm was obtained at a H2O concentration in the donor gas of about 0.1 %. When a H2O concentrationin the donor gas was less than 0.1 % the optical gain was significantly reduced due to a large amount of O2 which was generated by decomposition of the N2O. Small signal gain was monotonously increased with increasing the CO2 concentration up to 30%.
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  • Nobuhisa OHIGASHI, Kenji TSUNASHIMA, Hideo NAKAGAWA, Masanobu MORITA, ...
    1985 Volume 13 Issue 5 Pages 432-442
    Published: May 28, 1985
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    Raman regime free electron laser experiments for the wiggler pitches of 2cm and 3cm, were carried out. The radiation output pulse has a peak at the flat portion of the diode voltage pulse which is in the decreasing phase of the voltage. The beam energy and the time duration of the flat portion are 0.44 Me V and about lons, respectively. It is considered in the present experiments that the beam energy spread less than a few percent necessary for Raman regime operation, is attained at the flat portion. As a result, with wiggler field of 461 G and 2 cm pitch and axial guiding field of 13.7kG, it is observed that the total output power is 120 kW and the stimulated radiation spectrum has a maximum peak at 63 GHz. From the spectral spread and the width of frequency resolved radiation waveform, the beam energy spread Δγ11 γ11 is estimated as 3.8 %.
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  • Iwao KITAZIMA, Motoi SASAKI
    1985 Volume 13 Issue 5 Pages 443-452
    Published: May 28, 1985
    Released on J-STAGE: February 26, 2010
    JOURNAL FREE ACCESS
    The CARS intensity and spectral width were measured for light simple and heavy polyatomic molecules at the under-atmospheric gas pressure (50-760 Torr). The observed ratios of Raman cross section were 1: 1.3: 0.53 for N2: CO2: SF6, in agreement with the previous data. The collisional narrowing effect was found even at low gas pressure of CO2 400 Torr and of SF6 50 Torr while only the pressure broadening was observed in N2 CARS of this pressure range. The N2 gas additive enhanced much the CARS intensity rather than the He .The SF6 infrared active (ν3) mode excitation by a CO2 10.6μm laser irradiation reduced the CARS intensity of the ν1 mode but enhanced its hot bands. It was deduced from the different reduction effect of the CARS intensity between its P (20) and P (28) line irradiation that the N2 gas plays an important role as vibrational-rotational energy reservoir for the SF6 gas molecules excited in the quasi-continuum.
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