Thermal mapping compensated mirror and method of making the same

Details Thermal mapping compensated mirror and method of making the same Thermal mapping compensated mirror and method of making the same

1989-12-18

1991-02-19

Arnold, Bruce Y.

350607, 350610, G02B 510, G02B 718, G02B 508

Patent

active

049938240

ABSTRACT:
A thermal distortion effect compensated mirror includes a mirror substrate having a reflective surface, and a compensating layer on the reflective surface. The compensating layer is of a material that is substantially transparent to a laser beam to be reflected by the mirror, and has such a thickness as to substantially compensate, during the passage of the laser beam therethrough, for the differences in the propagation path lengths of different laser beam regions impinging on and reflected from different portions of the reflective surface that have been displaced to different extents from their original positions by different thermal growths of the respective underlying zones of the substrate owing to different heating of such substrate zones by different energy levels of the associated laser beam regions.

REFERENCES:
patent: 2294940 (1942-09-01), Skolnik
patent: 3609589 (1971-09-01), Hufnagel
patent: 4253739 (1981-03-01), Carlson

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