Coherent light generators – Particular beam control device – Nonlinear device
Patent
1988-09-06
1989-06-20
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Nonlinear device
372 26, 372 97, 372 11, 372 12, 372 69, H01S 310
Patent
active
048415286
ABSTRACT:
Higher efficiency in cavity dumping and frequency doubling in a laser used to produce modulated output beam pulses is achieved by deflecting light out of the resonant cavity to a third mirror through a frequency doubler using an electro-optic modulator and a polarizing beamsplitter in the resonant cavity, or using just an acousto-optic modulator to deflect light out of the laser cavity in response to a control signal (electric or acoustic). The frequency doubler in front of the third mirror rotates the frequency doubled light so that it will pass out of the laser cavity through the polarizing beamsplitter, while undoubled frequency light is reflected by the polarizing beamsplitter back into the gain medium of the laser. In the case of using a type-II frequency doubler, a dichroic beamsplitter deflects out the frequency doubled light and passes the undoubled frequency light to the polarizing beamsplitter for return to the laser gain medium. If an acousto-optic modulator is used, it deflects light out of the primary laser cavity, so a polarizing beamsplitter is not needed, and only a dichroic beamsplitter is needed to separate frequency doubled light out of the path from the third mirror.
REFERENCES:
patent: 3564454 (1971-02-01), Hook et al.
patent: 4413342 (1983-11-01), Cohen et al.
patent: 4484333 (1984-11-01), Chenausky et al.
patent: 4618957 (1986-10-01), Liu
patent: 4637026 (1987-01-01), Liu
Robinson Deborah L.
Sipes, Jr. Donald L.
California Institute of Technology
Jr. Leon Scott
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