Optical waveguide recording medium playing apparatus

Details Optical waveguide recording medium playing apparatus Optical waveguide recording medium playing apparatus

1991-11-29

1993-05-25

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 356345, G11B 700

Patent

active

052146332

ABSTRACT:
Disclosed is an optical waveguide recording medium playing apparatus which is characterized in that, in an optical system for reading and reproducing recorded information from an optical waveguide recording medium, an optical frequency modulating element for modulating light emitted from a super luminescent diode (SLD) as a light source is provided between the SLD and an objective lens for converging light on the photocoupler of the optical waveguide recording medium. The optical frequency modulating element comprises an ultrasonic light modulating element and a slit. The optical frequency modulating element drives the ultrasonic light modulating element with a frequency-modulated drive voltage to diffract the light from the SLD and limits the spatial spectrum of the diffracted light by means of the slit. Part of the diffracted light passes through the slit. As the voltage to drive the ultrasonic light modulating element is frequency-modulated, the pitch of an elastic wave formed in the ultrasonic light modulating element will be modulated. This varies the diffraction angle of the light of the same frequency, thus changing the frequency of light that passes through the slit. The optical system for generating reference light in heterodyne detection can therefore be miniaturized.

REFERENCES:
patent: 4995726 (1991-02-01), Fujita et al.

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