巻号一覧
15 巻, 12 号
選択された号の論文の7件中1～7を表示しています
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多田 邦雄1987 年 15 巻 12 号 p. 1032-1033
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (164K) -
黒部 篤, 植松 豊1987 年 15 巻 12 号 p. 1034-1042
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーThe reduction of the threshold current using quantum well (QW) structures is reviewed both theoretically and experimentally. A theory which takes into account gain flattening due to the two-dimensionality of quantum well is used to analyze experimental results of QW laser structures with various number of quantum wells. The lowesthreshold current density is realized by using single and multi quantum wells at long and short cavity lengths. An optimum cavity length, which minimizes the threshold current, is inversely proportional to thenumber of quantum wells. Close comparison between theory and experiment are made and the theory is found to be useful in optimizing quantum well structures.抄録全体を表示PDF形式でダウンロード (949K) -
丹野 直弘, 福田 英寿1987 年 15 巻 12 号 p. 1043-1051
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーA new interferometer by dual-wave-front generation in degenerate four-wave mixing is described with measurements of flame-temperature. The dual wave front created in a nonlinear medium automatically yields a self-referencing operation for a given phase of an incident probe beam. A phase-mismatching problem for nonconjugate wave generation is also considered. The experimental observations are shown using a dye-laser and Na-vapor system.抄録全体を表示PDF形式でダウンロード (1466K) -
回折効率の回折格子周波数依存性山口 武史, 氏原 紀公雄1987 年 15 巻 12 号 p. 1052-1058
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーGeneration of phase conjugate waves in a photorefractive Bi12SiO20 (BSO) crystal is studied with particular attention to the dependence of the efficiency on the spatial frequency of the written grating. The influence of mis-alignment between input beams is also investigated in detail. Since the diffracted output energy is particularly sensitive to the incident angle of the readout beam, alignning of the readout beam to meet Bragg conditionis of critical importance. It is found that diffraction efficiency is proportional to the square of the fringe spacing, ∧2, under the condition of relatively small spacing ∧while it is proportional to ∧-2 when the spacingexceeds a certain value. The result is consistent with “two-level charge transfer model ”proposed by Peltier etal. From the fringe spacing giving a maximum diffraction efficiency, the density of acceptor traps is determined to be 1.3 ×1015cm-3 in the BSO crystal used.抄録全体を表示PDF形式でダウンロード (743K) -
西浦 洋三, 西川 満, 大岡 明裕, 高阪 悠二1987 年 15 巻 12 号 p. 1059-1066
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーWe have studied the way to miniaturerize optics, fiber-coil and electronics for a compact fiber-optic-gyroscope (FOG). The optics were miniaturerized by using small bulk optic parts, and hybrid integrated circuits were developed for the electronics of the FOG. To compensate for the reduction of the Sagnac phase shift due to the small diameter of the fiber coil, a small diametered polarization maintaining single-mode fiber (PMSF) was developed. Long lengths of the fiber could be wound around a small sized coiling space. By using these components, a compact FOG with outer diameter of 60 mm and height of 50 mm was developed. Sensitivity of 0.8 deg/hr and drift of 3.6 deg/hr/hr were observed.抄録全体を表示PDF形式でダウンロード (853K) -
Sunao YAMADA, Sadanori YOSHIDA, Nariaki SATO, Hirofumi KAWAZUMI, Toshi ...1987 年 15 巻 12 号 p. 1067-1072
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーThe slow conductivity signal is induced by pulsed laser irradiation of pyrene in nonpotar hydrocarbon solvents. Its characteristics under the influence of the space charge effect have been measured in the ms-s region. The time profile of the slow conductivity signal varied dramatically with irradiation position of the laser beam between electrodes; there is a pronounced peak when irradiated at the middle of the two electrodes and there are two peaks (or one peak and one shoulder) when irradiated between the two electrodes. These peaks were assigned to drift of cations and anions, and their mobilities were almost identical.抄録全体を表示PDF形式でダウンロード (471K) -
YAGレーザーによる各種金属の加工特性渡部 武弘, 吉田 嘉太郎, 志茂 主税1987 年 15 巻 12 号 p. 1073-1084
発行日: 1987/12/28
公開日: 2010/02/26
ジャーナル フリーIn order to establish the mechanism of laser machining, machinability of various metals with different thermal properties was investigated. Metal plates were irradiated with one shot of the YAG laser pulses, and melting and removing processes were examined by observing machined shapes. The obtained results are as follows. (1) There exist four regions of the irradiation power density, where (a) only the melt zone is formed, (b) both the melt zone and removed zone are formed, (c) only the removed zone is formed, and (d) a laser plume is generated. (2) At a fixed power density the machined depth increases with increasing irradiation time, but is saturated at the depth that depends on the power density. (3) The machining processes in various metals, in spite of the wide variation of thermal properties, can be analyzed with the same machining mechanism. (4) Machinability indexes which give the easiness of machining with the pulsed YAG laser were determined for several materials. (5) Movement of the heat source point in the metal plate was estimated from the relation between the power density and the melt diameter.抄録全体を表示PDF形式でダウンロード (1162K)
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