Beam-shaping optical element and device for converting a beam ha

Details Beam-shaping optical element and device for converting a beam ha Beam-shaping optical element and device for converting a beam ha

1993-12-29

1995-11-14

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369116, 359710, 359711, 359894, 359641, G11B 700, G02B 2709

Patent

active

054673356

ABSTRACT:
A beam-shaping element for converting a beam having an elliptical cross-section into a beam having a circular cross-section. This element has a cylindrical entrance surface and a toriodal exit surface and can be arranged close to a diode laser so that the risk of wavefront deviations due to defocusing is reduced. The element has a high coupling efficiency.

REFERENCES:
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patent: 4915484 (1990-04-01), Yamamoto
patent: 5005928 (1991-04-01), Suzuki et al.
patent: 5068751 (1991-11-01), Braat et al.
patent: 5255113 (1993-10-01), Yoshikawa
"Fiber Microlenses Advance" R&D Magazine, Mar. 1992 p. 5.
"The Compact Disc Digital Audio System" M. G. Carasso et al, Philips Tech. Rev. 40, pp. 151-155, 1982, No. 6.

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