Efficient laser harmonic generation employing a low-loss externa

Details Efficient laser harmonic generation employing a low-loss externa Efficient laser harmonic generation employing a low-loss externa

1988-06-21

1991-06-25

Sikes, William L.

Coherent light generators

Particular beam control device

Nonlinear device

307427, 372 21, H01S 310, H03F 700

Patent

active

050273612

ABSTRACT:
TEM.sub.OOq laser radiation derived from a diode-pumped ring laser is directed into a faceted member of nonlinear optical material defining either a standing wave or ring monolithic optical resonator to generate harmonic laser radiation. The losses of the optical resonator, exclusive of the conversion loss to the harmonic, are made sufficiently low such that the dominant loss presented to the resonated mode of the optical resonator is the conversion loss to the generated harmonic. The reflectance of the input mirror of the optical resonator is impedance matched to the losses of the resonator including the harmonic conversion loss for optimum conversion efficiency. The length of the nonlinear optical material is shortened to the point where the bulk losses are less than ten times the sum of the surface and mirror losses, yielding conversion efficiencies of greater than 20 percent.

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Baumert, et al., "High-Efficiency Intracavity Frequency Doubling of a Styryl-9 Dye Laser With KNbO.sub.3 Crystals", Applied Optics 24:9 (1985) pp. 1299-1301.
Bergquist, et al., "High Power Second Harmonic Generation of 257 nm Radiation in an External Ring Cavity", Optics Comm. 43:6 (1982) pp. 437-442.

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