Multi-Beam Read-Verifying Optical Head for Parallel Recording

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...

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Published in:JPN J APPL PHYS PART 1 REGUL PAP SHORT NOTE REV PAP 1993, Vol.32 (11B), p.5406-5410, Article 5406
Main Authors: WATABE, A, TANABE, T, MURATA, S, KATOH, K
Format: Article
Language:English
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Applied sciences
Electronics
Exact sciences and technology
Magnetic and optical mass memories
Storage and reproduction of information
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container_title JPN J APPL PHYS PART 1 REGUL PAP SHORT NOTE REV PAP
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description 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 µm within a 70-µm 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 µm. The carrier to noise (C/N) ratio of a 1.53-µm-pitch voltage-controlled frequency oscillation (VFO) signal is 49 dB, which is sufficient for magneto optical (MO) disk data retrieval.
doi_str_mv 10.1143/JJAP.32.5406
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source IOPscience platform; Institute of Physics:Jisc Collections:IOP Publishing Read and Publish 2024-2025 (Reading List)
subjects Applied sciences
Electronics
Exact sciences and technology
Magnetic and optical mass memories
Storage and reproduction of information
title Multi-Beam Read-Verifying Optical Head for Parallel Recording
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