Optical beam expanders with materials chosen to effect athermali

Details Optical beam expanders with materials chosen to effect athermali Optical beam expanders with materials chosen to effect athermali

1987-03-17

1989-05-30

Corbin, John K.

350453, 350481, G02B 1314, G02B 300, G02B 910

Patent

active

048344729

ABSTRACT:
An optical substantially afocal beam expander has a negative lens element spaced from a positive lens element. The lens elements are of different materials with respective coefficients of refractive index change with respect to temperature such that the effect of a temperature change on one element is at least partially compensated by the effect of the temperature change on the other element. The beam expander is therefore substantially athermalised with respect to afocality.

REFERENCES:
patent: 2453218 (1948-11-01), Grey
patent: 3817604 (1974-06-01), Watt
patent: 4469396 (1984-09-01), Neil
patent: 4475793 (1984-10-01), Ford
patent: 4632520 (1986-12-01), Yamakawa
Refracting Afocal Systems in Thermal Imagers, Optical Engineering, Thomas H. Jamieson, vol. 19, No. 6 Nov./Dec. 1980, pp. 883-893.

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