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	Optical information recording and reproducing device
	OONUKI NOBUTAKA; ARIMOTO AKIRA; OSHIMA MASAHIRO; IDE TSUNEO; MORITA TATSUO
	1984-11-29
著作权人	HITACHI SEISAKUSHO KK
专利号	JP1984210541A
国家	日本
文献子类	发明申请
其他题名	Optical information recording and reproducing device
英文摘要	PURPOSE:To prevent the increase of noise due to the return light by oscillating intermittently the laser and setting the frequency of a high frequency current and the length of an optical path so that the reflected return light arrives at the laser emitting point while the laser oscillation is discontinued. CONSTITUTION:The luminous flux emitted from a semiconductor laser 1 is stopped down to a record surface of a recording medium 6 by an objective lens 5 after passing through a collimator lens 2a, polarized beam splitter 3 and a 1/4 wavelength plate 4. The luminous flux is reflected by the surface 7 and converted into a linear polarized light having the polarizing direction orthogonal to the original luminous flux. Then a current obtained by superposing a high frequency current to a direct current is impressed to the laser 1, and the laser is oscillated intermittently in a cycle of a high frequency to obtain many modes. The frequency of the high frequency current and the length of an optical path are set so that the phase difference theta between the oscillation light and the return light satisfies the conditions of an inequality (n: refractive index of the medium 6) at a light emitting point. As a result, the return light reaches the light emitting point while the laser oscillation is discontinued.
公开日期	1984-11-29
申请日期	1983-05-13
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/68680]
专题	半导体激光器专利数据库
作者单位	HITACHI SEISAKUSHO KK
推荐引用方式 GB/T 7714	OONUKI NOBUTAKA,ARIMOTO AKIRA,OSHIMA MASAHIRO,et al. Optical information recording and reproducing device. JP1984210541A. 1984-11-29.

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