Laser beam conditioner using partially reflective mirrors

Details Laser beam conditioner using partially reflective mirrors Laser beam conditioner using partially reflective mirrors

1996-12-19

1999-01-19

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

359629, G02B 2710, G02B 2714

Patent

active

058619917

ABSTRACT:
A laser beam conditioner consists of a partially reflective surface having a uniform reflectivity of approximately 38.2 percent and a totally reflective surface on opposite sides of a substrate. A coherent light beam incident onto the partially reflective surface of the laser beam conditioner will be partially reflected and partially transmitted. The partially transmitted portion of the coherent light beam will be multiply reflected between the totally reflective mirror and the partially reflective mirror within the beam conditioner, with a portion of light transmitted through the partially reflective mirror at each multiple reflection. The initially reflected portion of the coherent light beam and the transmitted portions of the multiply reflected beams form a conditioned light beam for a homogenizer. The partially reflective surface and the totally reflective surface are slightly less than parallel in order to introduce a minute angular spread among the delayed components of the multiply reflected beam. The spacing between the partially and totally reflective surfaces is at least half the coherence length of the laser beam.

REFERENCES:
patent: 4916712 (1990-04-01), Bender
patent: 5153773 (1992-10-01), Muraki et al.
patent: 5224200 (1993-06-01), Rasmussen et al.
patent: 5343489 (1994-08-01), Wangler
patent: 5661737 (1997-08-01), Hecht et al.

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