Patent
1984-08-20
1987-02-17
Punter, William H.
350405, G02B 300, G02B 2700
Patent
active
046435344
ABSTRACT:
The present invention deals with an optical transmission filter for effecting differential phase delay upon light in a beam polarized in a P dimension, as a function of position within the filter aperture for far field correction. The filter employs two lenses of birefrigent material, the crystal optic axes of the respective lens materials being oriented in mutually orthogonal positions and at a 45.degree. angle to the P dimension. The lenses have their adjacent surfaces respectively concave and convex with the same radius of curvature and their non-adjacent surfaces flat. The two lenses may be both spherical or both cylindrical.
The correction provides an improvement in beam quality in laser systems operating with larger beam apertures or at higher powers.
REFERENCES:
patent: 1976716 (1933-09-01), Ehringhaus
patent: 2601175 (1952-06-01), Smith
patent: 3758201 (1973-09-01), MacNeille
patent: 4461009 (1984-07-01), Lundstrom
patent: 4575849 (1986-03-01), Chun
Hunt, R. P., "A Variable Wedge Birefringent Compensator" App. Optics 5-1970, pp. 1220-1221.
Drichko, N. M., "Achromatic Compensator for Birefringent Wave Differences", Optics & Spectrosc (USA) 1-1970, pp. 66-67.
Chun Myung K.
Wang Sujane C.
Baker Carl W.
General Electric Company
Jacob Fred
Lang Richard V.
Punter William H.
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