Optical harmonic generator
Patent
·
OSTI ID:5273254
A pair of uniaxial birefringent crystal elements are fixed together to form a serially arranged, integral assembly which, alternatively, provides either a linearly or elliptically polarized second-harmonic output wave or a linearly polarized third-harmonic output wave. The ''extraordinary'' or ''e'' directions of the crystal elements are oriented in the integral assembly to be in quadrature (90/sup 0/). For a second-harmonic generation in the Type-II-Type-II angle tuned case, the input fundamental wave has equal amplitude ''o'' and ''e'' components. For a third-harmonic generation, the input fundamental wave has ''o'' and ''e'' components whose amplitudes are in a ratio of 2:1 (''o'':''e'' reference first crystal). In the typical case of a linearly polarized input fundamental wave this can be accomplished by simply rotating the crystal assembly about the input beam direction by 10/sup 0/. For both second and third harmonic generation input precise phase-matching is achieved by tilting the crystal assembly about its two sensitive axes (''o'').
- Assignee:
- The United States of America as represented by the United States Department of Energy
- Patent Number(s):
- US 4510402
- OSTI ID:
- 5273254
- Country of Publication:
- United States
- Language:
- English
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