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Volume 16, Issue 7
Displaying 1-9 of 9 articles from this issue
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Noboru MORIOKA1988 Volume 16 Issue 7 Pages 377-378
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (193K) -
Toshio KUROBORI, Nozomu TAKEUCHI1988 Volume 16 Issue 7 Pages 379-390
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe present status of color center lasers is described. Brief overview on laser-active color centers is given in addition to typical laser performance of output power, enlargement of tenability, single frequency operation and mode locking.View full abstractDownload PDF (1309K) -
Mechanism of melt and removal in laser machiningTakehiro WATANABE, Yoshitaro YOSHIDA, Chikara SHIMO1988 Volume 16 Issue 7 Pages 391-401
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn our former papers, machinability of various metals and machining phenomena were investigated to understand the laser machining mechanism. In this paper, machining processes and mechanism of material removal were further investigated to calculate profiles machined with a pulsed YAG laser. The obtained results are as follows.
(1) There are four types of machining processes, namely, heat conduction type, melting only type, mixed type of melt and removal, and removal only type. Some type of the processes will actually take place according to the power density and the irradiated time of laser beam and this information can be used for deciding the machining conditions. (2) The power density of irradiated laser beam decreases with increasing the machined depth and the reduction ratio is estimated by the experimental results of machinability. (3) There are two types of material removal in laser machining; one is the removal as melt and the other is the removal as vapor. And the vapor ratio which is defined as the fraction removed as vapor was estimated from the experimental result.View full abstractDownload PDF (1365K) -
Mineo HIRAMATSU, Toshio GOTO1988 Volume 16 Issue 7 Pages 402-409
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSComparison of the XeCl laser output performances using various rare gas mixtures as the diluent gas is described. The electron densities in the discharge-pumped XeCl laser using Ne, He, and Ne/Ar diluents are determined by measuring the Stark half-width of the Hβ line. The excitation mechanism of the discharge-pumpedXeCl laser using Ne/Ar diluent is discussed from the viewpoint of the electron energy distribution functions. It is shown that for the Ne/Ar diluent the higher electron density and the higher mean electron energy can lead to the efficient lasing at relatively low pressures.View full abstractDownload PDF (833K) -
Masahiro ISHIKAWA, Osamu FUJIWARA, Kazuo KATOH, Takashi AZAKAMI1988 Volume 16 Issue 7 Pages 410-416
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSLaser acupuncture is recognized as the biostimulation therapy with a low energy laser, while the mechanism has not been clear. However, in the pulsed laser acupuncture, the thermal stress caused by the photo-acoustic effect is thought to be the dominant factor of the biostimulation.
This paper proposes a method of calculating the spatial distribution of the thermal stress inside a human skin tissue using Hu's model for analyzing the photo-acoustic wave in the liquid. Numerical calculations show that the shape of the thermal stress depends on the absorption coefficient of the laser, that is, the stress due to the CO2 laser occurs sharply compared with the case of the YAG laser.View full abstractDownload PDF (791K) -
Hiroyuki DAIDO, Kunioki MIMA, Oneyoshi KITAGAWA, Sadao NAKAI, Chiyoe Y ...1988 Volume 16 Issue 7 Pages 417-429
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe CO2 laser driven implosion study is reported. We observed the high energy truncation in the hot electron energy distribution of the Cannonball target with inner pellet irradiation type. The results of implosion experiment agree with the simulation result including the high energy tail truncation. The implosion properties of 100 kJ laser irradiated pellet are also presented.View full abstractDownload PDF (1458K) -
Satoshi NISHIDA, Motowo TSUKAKOSHI, Akira MISU, Takahiro KASUYA1988 Volume 16 Issue 7 Pages 430-437
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA scanning laser microfluorometer has several advantages over a conventional optical microfluorometer especially in studies of biological specimen. This paper reports the construction and the performance of a computer-aided scanning confocal microfluorometric system which can be used for (1) measuring of fluorescence intensities at multiple wavelengths and intracellular distribution of fluorescence intensity at each wavelength, and (2) therewith composing a computer-processed distribution map of particular biological material.View full abstractDownload PDF (1078K) -
Chiyoe YAMANAKA1988 Volume 16 Issue 7 Pages 438-440
Published: July 28, 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (353K) -
1988 Volume 16 Issue 7 Pages e1
Published: 1988
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (37K)
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