巻号一覧
18 巻, 2 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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高橋 忠1990 年 18 巻 2 号 p. 52-53
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (152K) -
活性層均一性の効果佐々木 和明, 近藤 正樹, 赤木 与志郎, 中嶋 義晴, 山本 三郎, 土方 俊樹1990 年 18 巻 2 号 p. 54-60
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーNoise characteristics induced by optical feedback are investigated for two types of single longitudinal mode lasers. One is a conventional VSIS (V-channeled substrate inner stripe) laser and the other is a VSIS laser with a number of grooves on both sides of the V-channel. In this modified VSIS laser, we obtained a thin p-cladding layer and a uniform active layer. In the modified VSIS laser with a uniform active layer, a gain modulation pattern observed in the conventional one is eliminated. In addition, the noise level is found to be smaller than that of the conventional one when optical feedback (F-0.05%) exists, mainly due to the difference in the mode hopping behavior between two types of lasers. These results verify that the uniformity of the active layer is essential for improving the noise characteristics induced by optical feedback.抄録全体を表示PDF形式でダウンロード (1009K) -
CO2レーザー谷山 哲哉, 鈴木 薫, 中田 順治1990 年 18 巻 2 号 p. 61-68
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーGermanium, aluminum, and stainless-steel plates were irradiated with a pulsed CO2-laser beam (10.6μm) focused to be 0.1 mm in diameter, and resulting optical acoustic signals were measured with a PZT piezoelectric element. Results indicate that deposits on the surface and internal damage can be detected from the signal magnitude and phase angle, effectively by using repetitivefrequencies more than 100 Hz.抄録全体を表示PDF形式でダウンロード (886K) -
床並 雅宏, 大田 建久, 佐々木 和可緒, 村上 文夫1990 年 18 巻 2 号 p. 69-78
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーSimultaneous stabilization of the amplitude and frequency of a two-mode internal-mirror He-Ne laser (λ=633 nm) using a microprocessor controller is reported. The intensity difference between two orthgonally-polarized axial modes normalized by the total intensity is caluculated as a controlled signal. The cavity length is controlled by manipulating the current of a heater wound around the laser tube according to digital PID or I-PD algorithms so that the controlled signal coincides with a reference signal. By adjusting the reference signal, stabilized laser frequency can be tuned within ±300 MHz around the mean frequency of the atomic resonance frequencies of 20Ne and 22Ne. Frequency stability estimated by the error between the controlled and reference signals is better than 3×10-8 over a period of 30 minutes. Beat frequency fluctuations between two stabiliezed lasers over a 8 minutes are in the range 1×10-8 to 2×10-8 depending on the selected direction of polarization.抄録全体を表示PDF形式でダウンロード (1001K) -
興 雄司, 宇田 尚典, 本田 親久, 前田 三男, 長倉 正昭, 長谷川 芳夫, 森本 敬, 泉 順1990 年 18 巻 2 号 p. 79-83
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーA reliable, microcomputer-controlled nitrogen laser was developed, as a pumping source of a tunable dye laser for industrial analytical spectrometry. Long-term maintenance-free operation was attained by the use of internal gas circulation, automatic ga exchange, and output stabilization. TEA laser action with a gas mixture of He/N2 made the gas exchange easy. The output power was 400 kW, and the maximum repetition rate was 60 Hz.抄録全体を表示PDF形式でダウンロード (679K) -
西岡 一, 内山 太郎1990 年 18 巻 2 号 p. 84-87
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (422K) -
1990 年 18 巻 2 号 p. plate1
発行日: 1990年
公開日: 2010/02/26
ジャーナル フリーPDF形式でダウンロード (2682K)
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