The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 22, Issue 2
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Akira MATSUNAWA
    1994 Volume 22 Issue 2 Pages 79-80
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.79
    JOURNAL FREE ACCESS
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  • Nonlinear Optical Properties of Organic Crystals and Femtosecond Optical Pulse Compression
    Mikio YAMASHITA, Ryuji MORITA, Hiroyasu SONE
    1994 Volume 22 Issue 2 Pages 81-90
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.81
    JOURNAL FREE ACCESS
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    This article reviews our theoretical and experimental studies on ultrafast third-order nonlinearities of organic crystals, and femtosecond pulse propagation and compression using a nonlinear fiber cored by one of their crystals.
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  • Magnetic Field Effect on Oscillation Characteristics of a Semiconductor Laser
    Takashi SATO
    1994 Volume 22 Issue 2 Pages 91-99
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.91
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    The oscillation wavelength shift of a semiconductor laser in a magnetic field has been known since the early 60's. This research was made at very low temperatures and in very strong magnetic fields and the observed wavelength shift was toward a short wavelength side. The quantum wire and box lasers were discussed by using the effect of strong magnetic fields. These results were well accounted for in terms of the Landau level. The wavelength shift in a relatively weak magnetic field at room temperature by using Fabry-Perot type laser diodes was reported recently. The longer wavelength side shift and the output laser power decrease were observed simultaneously in a certain magnetic field direction. Since these changes observed in magnetic fields correspond to changes observed in a high temperature, it is assumed that the magnetic field increases the temperature around the active layer of the semiconductor laser.
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  • Pulse-Width Dependence of Saturation Energy of XeCl Amplifier
    Toshifumi HASAMA
    1994 Volume 22 Issue 2 Pages 100-107
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.100
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    Pulse amplification in XeCl gain mediums is studied experimentally and theoretically. Using the Frantz-Nodvik equation, the effective saturation energies for 320fs and 40ps pulse are estimated to be 0.85 and 1.3 mJ/cm2, respectively, from the energy extraction measurements. The numerical calculations of rate equations, which includes the equations describing the temporal variation of the populations of B-, C- and X-state, are carried out for various pulse widths. The good agreements of the effective saturation energies based on the calculations with the experimental ones demonstrate the validity of the rate-equation model. The model is also applied for pulse amplification in a KrF gain medium.
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  • Selective Photoionization Scheme for Atomic Gadolinium Laser Isotope Separation
    Naglaa El Sayed ALY, Keiji NOMARU, Yen Wei CHEN, Hideaki NIKI, Yasukaz ...
    1994 Volume 22 Issue 2 Pages 108-115
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.108
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    The selective photoionization scheme for separating 157Gd from natural gadolinium and the laser irradiation conditions in order to enrich 157Gd to 60-80% are discussed in the case of twoand three-step photoionization. The dependence of excitation pathways on J-values is also discussed. From the view point of ionization rate it is preferable to select the four-colour threestep photoionization scheme by using both the ground and the lowest metastable levels. Optimum laser irradiation conditions for gadolinium isotope separation are presented.
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  • Numerical Study of a High-Power, Optically-Pumped 385μm-D2O Laser Using the Fourier Expansion Method
    Koichi SASAKI, Kazuyoshi FURUHASHI, Kanji MATSUOKA, Masaaki NAGATSU, T ...
    1994 Volume 22 Issue 2 Pages 116-131
    Published: 1994
    Released on J-STAGE: July 30, 2010
    DOIhttps://doi.org/10.2184/lsj.22.116
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    Computer simulation of an optically-pumped, multiple-longitudinal-mode D2O laser at the wavelength of 385 μm is carried out based on a semiclassical laser theory. Fourier expansion method is adopted to solve the equations of motion for the density matrix elements in the presence of multiple longitudinal modes. Close agreements between numerical and experimental results are obtained in 1) oscillation efficiency, 2) pressure-dependency of the out put power, and 3) pressure-dependency of the pulse duration. Some spectral characteristics such asmodeshift phenomena obtained numerically are also consistent with experimental observations.
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  • Single-Longitudinal-Mode Operation of a TEA CO2 Laser Using a Time-Gated Gain Cell
    R.J. NORDSTROM, L.J. BERG, A.F. De SIMONE, N. SUGIMOTO
    1994 Volume 22 Issue 2 Pages 132-139
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.132
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    Stable and repetitive single-longitudinal-mode output from a pulsed TEA carbon dioxide laser has been achieved using a time-gated gain cell. The gain cell is operated as an oscillator for the time periods between the laser pulses. Before the TEA laser is triggered, the gain cell is rapidly switched below threshold to avoid saturation of the gain-switched spike in the TEA laser pulse. Standard dither-stabilization techniques can be used during the CW operation of the gain cell to position the output coupler for single-mode operation. This method for obtaining single-mode output from a pulsed TEA laser is completely automatic and very straightforward to implement.
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  • High Repetition Rate Nd3+ Glass Laser without an SCR Switch
    Masanori JYUMONJI, Yoichiro MASUDA
    1994 Volume 22 Issue 2 Pages 140-145
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.140
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    A high repetition rate Nd3+ glass laser without a SCR switch has been developed by using Hoya's new type glass (LHG-8) rod.
    This laser apparatus produces reproducible repetitive laser pulses of 560mJ/pulse at 1Hzwith the maximum repetition rate up to 30Hz, and the maximum average power of 22W.
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  • [title in Japanese]
    1994 Volume 22 Issue 2 Pages i
    Published: 1994
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.22.i
    JOURNAL FREE ACCESS
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