Optical filter polarizer combination and laser apparatus...

Details Optical filter polarizer combination and laser apparatus... Optical filter polarizer combination and laser apparatus...

G - Physics

02

B

88/121

G02B 5/22 (2006.01)

Patent

CA 1250474

OPTICAL FILTER POLARIZER COMBINATION AND LASER APPARATUS INCORPORATING THIS COMBINATION Abstract of the Disclosure The present invention deals with an optical filter polarizer combination providing a spacial transmission function to polarized incident light. When the light is in the form of a beam the combination may be used to reject extraneous light, or to modify the intensity profile of the beam as a radial or as a linear spacial function (orthogonal to the axis of the beam). The filter employs two lens elements of birefringent materials, with their crystal optical axes mutually orthogonal, and at 45° to the plane of polarization. Spherical lenses are employed for a radial spacial function and cylindrical lenses are employed for a linear spacial function. The combination is useful for mode selection in a stable laser oscillator, for beam quality improvement in a stable/unstable oscillator, and for fill factor enhance- ment in coupling energy from a laser oscillator to a laser amplifier.

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