Laser system with external optical feedback and use of such...

Details Laser system with external optical feedback and use of such... Laser system with external optical feedback and use of such...

2006-08-08

2006-08-08

Menefee, James (Department: 2828)

Coherent light generators

Particular beam control device

Mode discrimination

C372S098000, C372S108000

Reexamination Certificate

active

07088745

ABSTRACT:
A diode laser system providing a high-power laser beam with good spatial coherence, which can be focused to a small spot size over long distances and which has a good pointing stability. The laser system comprises a laser diode (301) adapted to emit a first light beam, where the first light beam comprises a plurality of spatial modes, selection means (304) adapted to select a predetermined part of the first light beam, and a reflector (306), where the laser diode and the reflector define a cavity and where the reflector is adapted to reflect the selected part of the first light beam back into the laser diode as a second light beam. The laser system is characterised in that the selection means is adapted to select a part of the first light beam corresponding to a spatial mode with a higher mode number than a spatial mode with maximum gain.

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C.J. Chang-Hasnain et al., “High Power With High Efficiency in a Narrow Single-Lobed Beam form a Diode Laser Array in an External Cavity,” Applied Physics Letters, vol. 50, No. 21, pp. 1465-1467 (May 25, 1987).
Martin B.H. Lobel, Ph.D., “Improvement of the Coherence Characteristics of Laser Diode Arrays Using Photorefractive Phase Conjugation”, Thesis at the Riso National Laboratory, Aug. 1998, Riso Denmark ISBN 87-550-2373-8).

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