The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 20, Issue 6
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Motoi NANJO
    1992 Volume 20 Issue 6 Pages 373-374
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_373
    JOURNAL FREE ACCESS
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  • Fusion Plasma Diagnostics by LIDAR Thomson Scattering
    Katsunori MURAOKA, Mitsuo MAEDA, Tohru MATOBA, Shin YAMAMOTO
    1992 Volume 20 Issue 6 Pages 375-391
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_375
    JOURNAL FREE ACCESS
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    LIDAR Thomson scattering method is a powerful new technique by which the electron tempera-ture and the density in magnetic confinement plasma devices can be measured through only one window, according to the principle of laser radar (LIDAR). After the successful measurement in the JET tokamak, the application of this technique to the ITER tokamak is under taken. Instead of the ruby laser system used in the first experiment at JET, a‘new laser’with an output energy of 2-10 J in 100-300ps FWHM at 10-100 Hz is required in a wavelength region of 700-800 nm, to improve temporal and spatial resolution. The present review introduces the history and the present situation of the LIDAR Thomson scattering method, and discusses the possibility of the development of the ‘new laser’.
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  • Frequency Stabilization of an Internal-Mirror He-Ne Laser by Means of a Microprocessor Controller. (II)
    Yoshito TANAKA, Tatehisa OHTA, Takumi ICHINOSE, Fumio MURAKAMI
    1992 Volume 20 Issue 6 Pages 392-397
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_392
    JOURNAL FREE ACCESS
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    This paper presents the detailed analysis of a frequency stabilized internal-mirror He-Ne laser (λ=633 nm) controlled digitally by making use of the dependency of the intensities of two orthogonal polarization modes on frequency detuning. A laser tube containing an equivolume mixture of Ne20 and Ne22 was used in the experiment. Frequency stabilities were evaluated in terms of the resolutions of the digitization of polarization mode intensities. A 14-bit resolution system provided a stability of better than 10-10 for the integration time of 0.1 to 250 [sec] while lower resolution systems exhibited lower stabilities. It was found that the flexure of the laser tube due to thermal expansion slightly changed the detuning characteristics and limited long-term stability.
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  • Development of a Flashlamp-Pumped, Conduction-Cooled, Nd: Glass Slab Laser
    Toshitaka YAMADA, Murray K. REED, Robert L. BYER
    1992 Volume 20 Issue 6 Pages 398-405
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_398
    JOURNAL FREE ACCESS
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    We have designed a conduction cooled Nd: glass zig-zag slab laser pumped by xenon flash-lamps. An improved 2-D ray tracing code can calculate the power coupling coefficient from the lamps to the slab, which qualitatively predicts a gain distribution. A calculated temperature rise at a 4 kW input power is about 6°, close to an observed temperature rise of 8°C. It is predicted that a 20 kW input power will give rise to a 30-degree temperature difference, which is close to the fracture limit of a 6mm thick LHG-5 slab.
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  • Development of a UV-Laser Excited Micro-Raman Spectrometer
    Shigeto TAKEDA, Hisako URABE, Ryosuke SHIMIZU, Motowo TSUKAKOSHI, Taka ...
    1992 Volume 20 Issue 6 Pages 406-410
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_406
    JOURNAL FREE ACCESS
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    A UV-laser micro-Raman spectrometer has been developed for the analysis of micro samples. High spatial resolution and resonance Raman and fluorescence-eliminated effects, which cannot be achieved in visible-laser excited systems, have been realized. Problems such as optical damage of samples are unsolved.
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  • Optical Sensors Constructed for an LD Pumped Solid-State Laser System
    Yoshio NISHIDA, Kenta NAITO, Masato OHMI, Koji ISHIKAWA, Tsuyoshi SATO ...
    1992 Volume 20 Issue 6 Pages 411-419
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_411
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    For a laser diode (LD) pumped solid-state laser system using high power LD arrays, compact optical sensors of high speed, high response, low noise and low cost are needed. We constructed optical probes using Ge avalanche photo-diode (APD) and Si-APD for the wavelength region of 0.3-1.6μm. To measure the intensity distribution of laser beams, spectral distribution, and wavelength shift of LD arrays, we used a CCD linear image sensor and a polychromator which were designed and constructed.
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  • [title in Japanese]
    1992 Volume 20 Issue 6 Pages i
    Published: June 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.6_i
    JOURNAL FREE ACCESS
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