The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 16, Issue 12
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Hiroo INOKUCHI
    1988 Volume 16 Issue 12 Pages 806-807
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.806
    JOURNAL FREE ACCESS
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  • Electric Field Measurements in Electrical Discharge using a Pockels Device
    Kunihiko HIDAKA
    1988 Volume 16 Issue 12 Pages 808-817
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.808
    JOURNAL FREE ACCESS
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    An optical method for measuring electric field by means of a Pockels device is described. The method has the advantages of directly measuring the electric field in space, of hardly disturbing the field distribution in the measuring space by inserting the device, and of containing no power source in the device. Thus it has been used to investigate the electric field distorted by space charges due to electrical-discharge development. The sensor system consists of a light source, a polarizer, a quarter-wave plate, a Pockels device, and analyzer and a photodetector. The relation between measurable field component and the required polarization-direction of the analyzer is summarized for representative Pockels devices. The method for eliminating the effect of space charges attached to the Pockels device is described. The typical electric fields are shown which are measured in and around corona and leader discharges propagating in a rod-to-plane gap of 0.2-3 m subjected to positive voltages of 0.1-1 MV.
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  • Polarization Properties and Frequency Stabilization of a 543-nm He-Ne Laser
    Kyoichi DEKI, Hiroshige HATA, Keiichi UJIIE
    1988 Volume 16 Issue 12 Pages 818-827
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.818
    JOURNAL FREE ACCESS
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    The polarization properties of a commercial internal mirror type 543 nm He-Ne laser (Melles Griot 05-LGR-171) in a transverse magnetic filed and in zero m. f. have been studied experimentally. Main features in a zero magnetic filed are the simultaneous existence of an orthogonal and a parallel polarizations in adjacent axial modes and the sudden interchange of the mode polarization depending on cavity detuning (polarization flipping). In a characteristic magnetic filed where the Zeeman frequency equals the mode spacing, we found that the polarization flipping is suppressed and the polarization directions of the adjacent modes always become orthogonal by setting the angle between the directions of the filed and the polarization for around 30°-42°. Three methods of frequency stabilization exploiting cavity detuning dependence of the polarizations, the output power, and the beat frequency between axial mode spacings under the above conditions are presented, and one of them is demonstrated. A frequency stability of 2.1 x 10-8 (58 minutes) was obtained.
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  • Growth and Second Harmonic Generation of Deuterated L-Arginine Phosphate Monohydrate Crystal
    Takatomo SASAKI, Kana FUJIOKA, Atushi YOKOTANI, Tatuhiko YAMANAKA, Sad ...
    1988 Volume 16 Issue 12 Pages 828-835
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.828
    JOURNAL FREE ACCESS
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    L-arginine phosphate monohydrate (LAP) is a promising nonlinear organic crystal for higher harmonic generator in place of a KDP crystal LAP has a large absorption at 1.06μm. We synthe-sized deuterated LAP (DLAP). The absorption coefficient was reduced to 0.02 cm-1 from 0.09 cm-1. The cut-off wavelength of ultra-violet light was 0.26μm. The phase-matching angles for this biaxial crystal were calculated using measured refractive indices at 1.06μm and 0.53μm. The measured angles at which maximum output of second harmonics for Type I and Type II were in fairly good agreement with the calculation. The effective nonlinear optical coefficient was almost twice and the acceptance angle was almost a half of the KDP crystal. We can say that DLAP can be used in place of KDP in high power lasers.
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  • Fabrication of High-Efficiency Zone Plate Array with Oblique Incidence Configuration
    Xiao Ping FENG, Kashiko KODATE, Takeshi KAMIYA
    1988 Volume 16 Issue 12 Pages 836-846
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.836
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  • YAG Laser Soldering System and Soldering Characteristics for Flat Package IC
    Hiroshi MIURA, Kazumi ISHIKAWA, Satoru ARUGA
    1988 Volume 16 Issue 12 Pages 847-855
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.847
    JOURNAL FREE ACCESS
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    Recent sophisticated IC's having high-density and super-multiple pins are highly heat sensitive. Such IC's have to be soldered by a localized heat source, separately from other soldered components. This paper describes a new YAG laser soldering system composed of a YAG laser, a fiber and a rectangular robot. The robot supplies paste solder, positions a flat package IC and moves the optical fiber for transmitting YAG laser light to the spots to be soldered.
    Experimental results are: 1) The accuracy of pin positions for a 100-pin flat package IC was within ±90μm and in good conformity with calculation; 2) Continuous supply of paste solder was enough to obtain good laser solderabilities; 3) Pre-heating relieved these good solderability conditions; 4) Peel-off strength test of soldered flat package IC leads showed that the adhesion strength between the glass-epoxy resin and thin copper foil wasn't weakened by laser irradiation, and the strength of laser soldered portion exceeded this adhesion strength. About 200 pieces of, heat-sensitive flat package IC's which were not considered to be durable under a conventional soldering system were soldered by this system without any damage.
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  • Nondestructive Testing by Optically Sensing of Photo-induced Mechanical Vibration
    Kazuhiro HANE, Shuzo HATTORI
    1988 Volume 16 Issue 12 Pages 856-862
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.856
    JOURNAL FREE ACCESS
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    In this note, the applications of a photothermal effect to nondestructive testing are reported. Irradiation of chopped laser light generates the flexural vibration of a plate-like sample by the thermoelastic bending effect. The vibration is sensitive to sample irregularity and mechanical conditions such as fixed ends or adhesively bonded structure. Hence the vibration has been used advantageously for (1) imaging the irregularity of a clamped plate-like sample, (2) detecting the delamination in layered materials, (3) inspecting the strength of soldered connections and (4) sensing the external force acting on a small mechanical beam. These techniques are all optical and noncontact since the vibration is monitored by probe beam deflection or with a optical interferometer. The driving force of the vibration is explained theoretically from the viewpoint of temperature moment.
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  • Report on the 4th International Conference on Infrared Physics
    Shigeki OKAJIMA
    1988 Volume 16 Issue 12 Pages 863-868
    Published: December 28, 1988
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.16.863
    JOURNAL FREE ACCESS
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