The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 19, Issue 10
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Koichi TOYODA
    1991 Volume 19 Issue 10 Pages 927-928
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_927
    JOURNAL FREE ACCESS
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  • Intracavity Frequency Conversion Lasers
    Hirotoshi SOUMA, Toshiteru MAEDA, Chuji HORIE
    1991 Volume 19 Issue 10 Pages 929-940
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_929
    JOURNAL FREE ACCESS
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    To describe intracavity frequency conversions in laser systems consisting of two laser cavi-ties combined with a nonlinear optical crystal, we analized rate equations and derived the out-put characteristics of the intracavity frequency conversion. From these results the existence of forbidden ranges in nonlinear coupling coefficients is discussed. For practical applications, effects due to a beam walk-off and an acceptance angle are taken into consideration.
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  • Development of New Nonlinear Optical Crystal LiB3O5
    Yicheng Wu, Chuangtian Chen
    1991 Volume 19 Issue 10 Pages 941-949
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_941
    JOURNAL FREE ACCESS
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    The present paper reviews the recent work on developing new nonlinear optical crystal LiB3O5. On the bassis of the anionic group theory of the nonlinear optical effect, boron-oxygen groups of various structure types in borate crystals were classified and the microscopic second-order susceptibilities of the basic anionic groups were calculated. From the calculated results the following structural guideline was proposed: the B3O7 group is an ideal basic structural unit for new UV nonlinear optical crystals. The LiB3O5 crystal, with the B3O7 group as the basic structural unit, was recognized as an excellent UV nonlinear optical material after phase relationship studies, crystal growth, and measurements of various physical properties.
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  • Mathematical Treatment of Infrared Multiphoton Dissociation Induced by Non-Uniform Non-Gaussian Laser Beam
    Kei SUNOUCHI, Kazuo TAKEUCHI
    1991 Volume 19 Issue 10 Pages 950-955
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_950
    JOURNAL FREE ACCESS
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    A mathematical treatment is proposed for the evaluation of a reaction volume when a non-uniform, non-Gaussian laser beam is focused in the center of the reaction cell. The transverse profile of the beam is approximated with a uniform inner part and a Gaussian outer part. A beam utilization factor is described simply as a function of the beam profile and the reaction characteristics when the reaction is unsaturated.
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  • Calculation of Lidar Multiple-Scattering in a Uniform Medium and Its Effect on Visibility
    Nobuo TAKEUCHI, Shang-Qian WU
    1991 Volume 19 Issue 10 Pages 956-965
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_956
    JOURNAL FREE ACCESS
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    A multiple scattering effect is an influential factor in the lidar measurements of fog, cloud and other optically thick mediums. An empirical formula has been proposed for the multiple scattering correction; however, the multiple scattering effect is largely dependent on situations. In this study, the effect was studied by the Monte Carlo method for uniform scatterers by assuming the Cloud C-1 phase function that has strong forward scattering. The dependence on field-of-view, extinction coefficient, and distance was obtained by least square fitting. On the basis of results obtained, the effect of mutiple scattering on visibility was discussed and found that the error is less than 10% for a small field-of-view angle.
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  • A Practical CW Nd:YAG Slab Laser
    Toshitaka YAMADA
    1991 Volume 19 Issue 10 Pages 966-969
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_966
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    We have built a properly designed, practical cw zig-zag slab laser using a Nd:YAG slab (doped Nd:1.0at%) with a size of 1137 mm × w8 mm × t6 mm, pumped by two krypton arc lamps in a gold-coated elliptical cavity. A cw output power of 130 W at maximum with 2 mrad divergence, smallest ever in the zigzag plane has been obtained. However, the slab acted like a rod on beam divergence in the non-zigzag plane. To reduce beam divergence in this direction, we propose a novel path-averaging resonator using a double roof reflector.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    1991 Volume 19 Issue 10 Pages i
    Published: October 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.10_i
    JOURNAL FREE ACCESS
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