MULTIBEAM READ-VERIFYING OPTICAL HEAD FOR PARALLEL RECORDING

被引：4

作者：

WATABE, A

TANABE, T

MURATA, S

KATOH, K

机构：

[1] NTT Interdisciplinary Research Laboratories, Musashino-shi, Tokyo, 180

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 1993年 / 32卷 / 11B期

关键词：

MULTIBEAM; HOLOGRAPHIC GRATING; MAGNETOOPTICAL DISK; READ-VERIFYING; PARALLEL RECORDING; OPTICAL HEAD; DATA TRANSFER RATE;

D O I：

10.1143/JJAP.32.5406

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A five-beam read-only optical head using a holographic beam splitter has been developed for instantaneous read-verification of parallel data recording. The holographic grating made of photo-resist film splits a 680-nm laser beam into five diffracted beams and an interval angle of 4 mrad. The average diffraction efficiency of the beams is about 13% and their spot diameters are 1.05 +/- 0.03 mum within a 70-mum image circle. A newly designed objective lens system composed of an aspherical lens and a chromatic lens can compensate 680 nm to 780 nm of chromatic aberration of wavelength to less than 0.4 mum. The carrier to noise (C/N) ratio of a 1.53-mum-pitch voltage-controlled frequency oscillation (VFO) signal is 49 Db, which is sufficient for magneto optical (MO) disk data retrieval.

引用

页码：5406 / 5410

页数：5