Compensation of thermal expansion in mirrors for high power radi

Details Compensation of thermal expansion in mirrors for high power radi Compensation of thermal expansion in mirrors for high power radi

1978-06-07

1981-09-01

Evans, F. L.

Radiant energy

Ion generation

Field ionization type

350310, 350166, G02B 508, H01J 2700

Patent

active

042874211

ABSTRACT:
A mirror for reflecting the high power radiation of laser beams while maintaining the predetermined shape of the reflecting surface. Radiation is reflected by a front, typically dielectric, surface on a transparent substrate. Since some power is unavoidably absorbed at the reflecting surface, the mirror will experience a thermal expansion. Some incident radiation is also transmitted to the opposite side of the substrate where at least a portion of the transmitted radiation is absorbed to a degree preselected to provide thermal expansion of that opposite side complementary to the expansion of the reflecting surface. The two expansions can be adjusted such that the shape of the reflecting surface is affected far less by the incident radiation than in the case where no opposite side absorption is provided.

REFERENCES:
patent: 3609589 (1971-09-01), Hufnagel
patent: 4147409 (1979-04-01), Apfel

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