Coherent light generators – Particular beam control device – Nonlinear device
Patent
1994-04-07
1995-05-02
Lee, John D.
Coherent light generators
Particular beam control device
Nonlinear device
359326, 372 23, H01S 3109
Patent
active
054126746
ABSTRACT:
An apparatus for producing rapidly modulated coherent optical emission is described in which a doubly resonant cavity produces amplitude modulated sum frequency generation. The configuration of the resonator provides a region where both fundamental wavelengths are overlapped and another region where both fundamental wavelengths are spatially distinct. The resonator further contains a laser gain element in the other region where the wavelengths are spatially distinct to produce one of the two fundamental resonant wavelengths. A laser source injects a signal into the resonator at the other resonant wavelength. The injected wavelength is at or near a wavelength for which the laser gain element can be optically pumped. In one embodiment, one laser both injects a signal into the resonator and simultaneously pumps the laser gain element contained within the resonator cavity. The resonator further contains a nonlinear crystal for intracavity sum frequency generation of the two fundamental wavelengths. By amplitude modulation of the injected signal, an amplitude modulated sum frequency generated signal is produced. Sum frequency generation at 439 nm is described in a noncritically phase matched Type II KTP crystal by simultaneously resonating the cavity at 1.318 .mu.m and 659 nm.
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Fendelman Harvey
Keough Thomas Glenn
Lee John D.
The United States of America as represented by the Secretary of
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