光盘多信道存贮分光技术

本文对光盘存贮技术中应用的多频声光和衍射光栅分光技术进行了分析、研究.并以二元计算全息理论为基础,用脉位调制技术通过计算机模拟,获得了产生均匀多光束衍射的位相光栅的精确周期结构参数.据此,研制了总衍射效率为73%,最大残余偏差为17.5%能满足实用要求的九光点均匀衍射位相光栅.

Beam-splitting techniques in multichannel optical disk memory

An analysis of multifrequency A-O deflections and diffraction grating for multibeam-splitting techniques applied in the optical disc storage is given in this paper. Based on the theory of binary computer-generated holograms, accurate periodic parameters of a phase grating which can generate equal-intensity multiple beams are obtained by using pulse position modulation in terms of computer analogue. According to the parameters, a phase grating has been fabricated by a special method. The phase grating has a total diffraction efficiency of 73% with the maxruum residual deviation of 1.75% from the average, which can meet the practical usage.