Method of continuous motion for prolong usage of optical element

Details Method of continuous motion for prolong usage of optical element Method of continuous motion for prolong usage of optical element

1997-08-18

1998-10-20

Epps, Georgia

Optical: systems and elements

Lens

With support

359813, G02B 702

Patent

active

058255621

ABSTRACT:
A method and apparatus are described for prolonging the usage life of an optical element under the irradiation of an intensive laser beam. The method employs a continuous mechanical motion to enlarge the effective interaction area and the volume of the laser beam within the optical element. In an embodiment, the apparatus is used for harmonic generation of a laser beam within a BBO crystal. A motor is used to drive the BBO crystal mounted on a pair of translation slides. The crystal is moved on a circular path spiraling within a predetermined area while its optical axis remains in the same orientation in relation to a laser beam. The phase matching angle of the BBO is maintained during the movement, and the usage life of the BBO crystal is increased by many orders of magnitude.

REFERENCES:
patent: 3826578 (1974-07-01), King et al.
patent: 5401948 (1995-03-01), Krichever et al.

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