Optical beam shaping system

Details Optical beam shaping system Optical beam shaping system

1985-07-05

1987-01-06

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

350402, 350433, 369121, G11B 700, G02B 306

Patent

active

046352449

ABSTRACT:
An optical system includes a semiconductor laser for emitting a laser beam, a coupling lens for converting the laser beam a parallel beam, an optical beam shaping system for increasing the diameter of the parallel beam in a direction in which the semiconductor laser has a smaller far field pattern, and an objective lens for focusing a beam shaped by the optical beam shaping system into a spot. To make the spot substantially circular in shape and increase the light utilization efficiency, the magnification of the optical beam shaping system in a direction parallel to the junction plane of the semiconductor laser is selected to fall in a certain range.

REFERENCES:
patent: 4253735 (1981-03-01), Kawamura et al.
patent: 4318594 (1982-03-01), Hanada
patent: 4564931 (1986-01-01), O'Hara et al.

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