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Volume 7 (1979)
- Issue 4 Pages 335-
- Issue 3 Pages 226-
- Issue 2 Pages 123-
- Issue 1 Pages 1-
Volume 7, Issue 4
Displaying 1-13 of 13 articles from this issue
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Hiroshi KASHIWAGI1979 Volume 7 Issue 4 Pages 335-336
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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Koichi SHIMODA1979 Volume 7 Issue 4 Pages 337-347
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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Toshio FUKUMI1979 Volume 7 Issue 4 Pages 348-357
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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Junichi SAKAI1979 Volume 7 Issue 4 Pages 358-366
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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1979 Volume 7 Issue 4 Pages 366
Published: 1979
Released on J-STAGE: February 26, 2010
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Cis-trans Photoisomerization of StilbeneKeitaro YOSHIHARA1979 Volume 7 Issue 4 Pages 367-370
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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Tomoo YANASE, Tsuyoshi YAMANE1979 Volume 7 Issue 4 Pages 371-376
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe characteristics of high power laser beam (Nd: YAG, λ=1.06μm) transmission usinglow loss optical fibers are investigated. It is shown that the low loss plastic cladding qquartz glass core fiber can transmit even such high power as the 160W cw laser light and 120 kW (peak-value) pulse laser light without any damage. As an application of this high power laser transmission using optical fibers, semiconductor silicon processing has been performed, irradiating silicon substrates with the transmitted laser light. It has been found that the processed silicon surfaceis uniform and the processed spot has a sharp edge.View full abstractDownload PDF (866K) -
Kenji TATSUMI, Sho ITO, Makoto ONO1979 Volume 7 Issue 4 Pages 377-384
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSNear field patterns and irradiance on optical axis have been calculated for plane-wave gaussian beams truncated by circular soft-apertures. Kirchhoff's integral was calculated numerically, using the small-angle Fresnel approximation. And these numerical resuits was confirmed experimentally.
Followed by the numerical and experimental results, the ripples caused by diffraction by soft-apertures were reduced as compared with those by hard-apertures.View full abstractDownload PDF (670K) -
Masayuki ABE, Hisashi HAMAGUCHI, Tatsuyuki SANADA, Shigenobu YAMAKOSHI ...1979 Volume 7 Issue 4 Pages 385-393
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA New type GaAlAs monolithic lens coupled LED has been proposed and developed to achieve the highly efficient performance for fiber-optical communications. A GaAlAs lens monolithically formed on the LED surface and the spherical-ended fiber are efficiently coupled under the optimized design. Using the lensed LED having the magnification β of 2, the efficiency was improved 4 times better than that of flat LED. The lens radius of 80μm and thickness of 60 μm are chosen. The improvement factor β2 in efficiency was confirmed for β of from 1.6 to 2.2. For LED with the emitting diameter of 20 μm, at the forward current of 100mA, powers of 0.7 and 1.2 mW were coupled into 0.16 N A, 85 μm core, and 0.28 N A 100 μm core step index fibers, respectively.View full abstractDownload PDF (1171K) -
(An Approach with Self-Similar Solutions)Hideaki TAKABE, Takashi YABE, Katsunobu NISHIHARA1979 Volume 7 Issue 4 Pages 394-400
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSMany analysis on the ablation structure have been done under the assumption of the stationary propagation. However, as the laser becomes high intensity and short pulse, treatments of the problems as the non-stationary ones become important. In this paper, it is pointed out that one fluid two temperature hydrodynamic equations with the nonlinear electron heat conduction and ion electron energy relaxation show the self-similar motions under the appropriate boundary conditions and we can get varioussolutions under the different similarity parameter α.
Ablation structure of plane D-T torget plasma is analysed using the self-similar solution. It is found that self-similar ablation strueture cannot supply a constant compression pressure under the constant energy absorption, and in order to maintain the constant ablation pressure it is nesserary to increase the absorbed power in propotionto t1/5.View full abstractDownload PDF (676K) -
Yasuhiro AWAKURA1979 Volume 7 Issue 4 Pages 401-407
Published: November 30, 1979
Released on J-STAGE: November 22, 2010
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1979 Volume 7 Issue 4 Pages 408-434
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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1979 Volume 7 Issue 4 Pages 435
Published: November 30, 1979
Released on J-STAGE: February 26, 2010
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