The compensability between the longitudinal and transverse mismachining tolerance of grating in the optical pick-up head
In this paper numeric analysis is made to the influence of the longitudinal mismachining tolerance (LMT)and the transverse mismachining tolerance (TMT) of the grating in the optical pick-up head (GOPH) of VCD, DVD, and CD-ROM on the transmissivity and the intensity ratio of the auxiliary light beam to the main read-write light beam (IRAM) by using the general expression of diffraction efficiency obtained from the scalar diffraction theory. On solving GOPH problem, the scalar diffraction theory and the vector diffraction theory are coincident, and the scalar diffraction theory is reliable. The result shows that LMT and TMT can compensate for the inverse effect of IRAM, however, at the expense of reducing transmissivity. As far as GOPH is concerned, the goodness that LMT and TMT can be effectively compensated for is very advantageous in manufacturing of the grating.
作 者： 巴音贺希格 齐向东 李文昊 唐玉国 作者单位： Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033 刊 名： 激光与光电子学进展 ISTIC PKU 英文刊名： CHINESE OPTICS LETTERS 年，卷(期)： 2004 2(5) 分类号： 关键词：