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16 巻, 10 号
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伊賀 健一1988 年 16 巻 10 号 p. 634-635
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (204K) -
重力波天文学への期待河島 信樹1988 年 16 巻 10 号 p. 636-644
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーThe present status of the laser interferometer gravitational antenna is described based on the construction of an ISAS 9.7m 102 bounce antenna. The future prospect of constructing a kilometer class antenna is also discussed together with its construction in space including the lunarsurface.抄録全体を表示PDF形式でダウンロード (1059K) -
後藤 令幸, 八木 俊憲, 永井 治彦1988 年 16 巻 10 号 p. 645-653
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーMany attempts to synthesize diamond films have been made recently because of the high potentiality for various applications. The films were produced by a variety of methods, including thermal chemical vapor deposition (CVD) using a hot tungsten filament, plasma CVD and photo-induced CVD. Among these techniques, photo-induced CVD seems promising for the deposition of microelectronic materials at low temperatures.
This paper reviews the properties of diamond, its evaluation methods and the progress in the synthesis of diamond by gas-phase deposition. Detailed descriptions are presented on the laser-induced CVD developed by us, in which diamond films are deposited on Si wafers by decomposing a gaseous mixture of CCl4 and H2 with an Ar F excimer laser. The structures of the deposited films were characterized by Raman scattering and reflection electron diffraction analysis. The experimental results obtained from an optical emission spectroscopic study and the reaction mechanism are discussed.抄録全体を表示PDF形式でダウンロード (1219K) -
数値解析方法とアルミニウムの解析結果渡部 武弘, 吉田 嘉太郎, 志茂 主税1988 年 16 巻 10 号 p. 654-663
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーThis paper describes a numerical method to estimate shapes generated by pulsed YAG laser irradiation and the results for aluminum calculated by the method. Generally, it is difficult to make a close examination of the shapes machined because of various complicated phenomena and the change in thermal constants by temperature rise in laser machining; therefore, some of parameters necessary for the calculation are determined experimentally. The change in thermal constants of a workpiece by temperature rise, the characteristics of a laser beam used, the reflectivity change of a laser beam at the work piece surface, and the laser plume generation are considered in the calculation. The results of the calculation agree well with experimental results. Irradiating conditions in laser machining, therefore, are decided easily by this computer simulation.抄録全体を表示PDF形式でダウンロード (1132K) -
三浦 宏, 笹川 隆, 関 貞夫1988 年 16 巻 10 号 p. 664-674
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーA new materials processing system with a Nd: YAG laser was developed and operated in FMS. This system was applied to remove burrs generated along the involute curve after gear cutting and to break chips generated at the finishing stage of sleeves boring. Automatic debarring and chip breaking operations have been achieved for the first time to produce gears and sleeves. Specifically speaking, a Nd: YAG laser debarring head, a chip breaking head and an optical switch were specially designed and produced. They were installed on the processing station in the FMS, together with a YAG laser oscillator and condensing optics which feed a laser beam into affine core fiber. The machine complex station interfaces the YAG laser processing system. The 3rd cell of the station traces an involute curve, thus enabling the removal of burrs, or holds a chip breaking head and bores a sleeve chucked by the 1st cell simultaneously breaking a generated chip.抄録全体を表示PDF形式でダウンロード (2040K) -
β線吸収を用いた燃料充填評価法の開発真野 豊司, 片山 秀史, 高木 勝, 乗松 孝好, 田中 和夫, 加藤 義章, 中井 貞雄, 山中 千代衛1988 年 16 巻 10 号 p. 675-680
発行日: 1988/10/28
公開日: 2010/07/30
ジャーナル フリーThe non-destructive measurement of containment of hydrogen in a cryogenic foam target is reported. Penetration of liquid hydrogen into a plastic foam shell is evaluated from measurements of β-ray attenuation through the foam shell. Freeze-dried polystyrene foam is found suitable for the cryogenic foam target material.抄録全体を表示PDF形式でダウンロード (587K) -
佐々木 浩一, 吉岡 政信, 築島 隆繁1988 年 16 巻 10 号 p. 681-690
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーThe feedback stabilization of injection-locked Two-Longitudinal-Mode-Beating (TLMB) in a TEA CO2 laser is proposed and realized. The TLMB output is to be utilized as a ponderomotive source for driven scattering plasma diagnostics. The cavity length of the TEA CO2 laser is tuned such that the frequency of the injected laser is to be located at the center between two adjacent longitudinal modes. Special provision is made to protect the feedback loop from high intensity radiation of the main laser. Power-modulated outputs with a beat-frequency of around 40 MHz are obtained with a probability of about 84 percent for fifty successive shots. The so-called plasma chirp effect is found to be negligible in the present system.抄録全体を表示PDF形式でダウンロード (1138K) -
武内 清, 黒沢 宏, 佐々木 亘, 瀧川 靖雄, 吉田 国雄, 藤原 閲夫, 加藤 義章1988 年 16 巻 10 号 p. 691-698
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーQuartz glass (SiO2), silicon single crystal (Si) and molybdenum single crystal (Mo) have been tested for the cavity reflector of an argon excimer laser which supplies intense coherent radiation at 126nm. These mirrors have been used with a combination of a MgF2 output coupler. The laser output energy was found to be limited by damage threshold of the mirrors. The maximum output energy of 50mJ per pulse was obtained with the cavity composed of a Mo reflector and a MgF2coupler. No damage was observed on the Mo mirror surface. The duration of the laser output pulse depends on the argon gas pressure and also the reflectors. The mirror damage is discussed with relation to pulse shortening observed in high power rare-gas excimer lasers of Xe, Kr and Ar.抄録全体を表示PDF形式でダウンロード (1141K) -
大山 俊之, 小林 雅義, 石井 忠浩, 武内 一夫1988 年 16 巻 10 号 p. 699-704
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーA TEA-CO2 laser-induced breakdown technique was applied to synthesize fine powders of Band TiB2 by irradiating gas mixtures of BCl3+H2 and BCl3+TiCl4+H2 of 10-500 Torr. The products were characterized by SEM, ICP atomic emission spectroscopy and electron and X-ray diffraction. The particle sizes of the powders were controllable from 0.08 to 0.3μm by varying the total pressure of the mixed gas. The gas breakdown threshold energy of the laser pulse was found to be inversely proportional to the total pressure of the gas mixtures in a logarithmic scale, and the proportional constant was -0.52 for BCl3+H2. The yields of particles were increased with increasing laser pulse energy, whereas average particle size was constant.抄録全体を表示PDF形式でダウンロード (949K) -
佐々木 孝友1988 年 16 巻 10 号 p. 705-711
発行日: 1988/10/28
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (774K)
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