Coherent light generators – Particular beam control device – Nonlinear device
Patent
1991-03-15
1992-08-04
Epps, Georgia Y.
Coherent light generators
Particular beam control device
Nonlinear device
372 22, 372105, 359330, 359328, H01S 310
Patent
active
051365979
ABSTRACT:
An improved geometry is disclosed for enhancing the efficiency of second harmonic conversion in a Type II phasematching material. In this approach, the effects of wave vector double refraction are used to compensate for the effects of Poynting vector walk-off. To achieve this goal, the input fundamental beam 32 is arranged to enter the doubling crystal 30 at an oblique angle of incidence. This angle is selected so that the wave vector double refraction angle is equal to the Poynting vector walk-off. In order to maximize doubling efficiency, the axes of the crystal must be oriented so that the optimum phasematching angle coincides with the propagation axis of the refracted fundamental beam travelling in the crystal. The subject invention is particularly suited for use with a KTP crystal in either intracavity doubling or in an external resonant geometry.
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patent: 5033057 (1991-07-01), Bosenberg et al.
patent: 5047668 (1991-09-01), Bosenberg
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Coherent Inc.
Epps Georgia Y.
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