Optical transmission filter for far field beam correction

Details Optical transmission filter for far field beam correction Optical transmission filter for far field beam correction

G - Physics

02

F

88/121

G02F 1/19 (2006.01)

Patent

CA 1250473

AN OPTICAL TRANSMISSION FILTER FOR FAR FIELD BEAM CORRECTION Abstract of The Disclosure 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 birefringent?material, the crystal optic exes of the respective lens materials being oriented in mutually orthogonal positions and at a 45° 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.

489713

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