Coherent light generators – Particular operating compensation means
Patent
1988-08-15
1990-06-19
Scott, Jr., Leon
Coherent light generators
Particular operating compensation means
372105, 372106, 372 27, H01S 300
Patent
active
049359320
ABSTRACT:
A laser beam shaper which provides polarized output with a high spatial quality, utilizing induced stress birefringence. The laser beam shaper in which light resonates along a resonant path defined by reflective surfaces includes a solid state medium, such as a Nd:YAG rod which exhibits thermally induced stress birefringence that is of known, azimuthally independent distribution in planes perpendicular to the resonant path. On either side of the medium, quarter-wave retardation plates are provided which create essentially circular polarization of the resonant light within the medium. Sandwiching the quarter-wave plates and the medium are the first and second polarizing elements, both of which are aligned along the same preferred plane. By inducing stress birefringence in the medium, an output beam is produced. A shape defined by the distribution of the birefringence is provided. With media such as YAG, the shape of the beam is round with high quality.
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DiFonzo John C.
Herbst Richard L.
Johnson Bertram C.
Jr. Leon Scott
Spectra-Physics Inc.
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