Optical: systems and elements – Optical frequency converter – Parametric oscillator
Patent
1990-06-26
1991-09-10
Davie, James W.
Optical: systems and elements
Optical frequency converter
Parametric oscillator
372 20, 372 21, H03F 700
Patent
active
050476688
ABSTRACT:
A walkoff-compensated frequency conversion system such as an optical parametric oscillator includes a pair of nonlinear crystals, such as Beta-Barium Metaborate, aligned in an optical cavity with their optical axes at an angle .THETA. with respect to the axis of the cavity. The crystals are oppositely disposed with respect to the cavity axis so that the angle between their respective optical axes is 2.THETA.. In an optical parametric oscillator, the crystals are pumped to produce optical parametric luminescence and frequency conversion, the luminescence being emitted as signal and idler beams. The opposite arrangement of the optical axes of the crystals causes the pumping beam to walk off the signal beam in the first crystal and to walk on the signal beam in the second crystal. Similar walkoff compensation is provided in other frequency conversion systems wherein crystal pairs are oppositely disposed along a cavity optical axis.
REFERENCES:
patent: 4639923 (1987-01-01), Tang et al.
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"Barium Borate Optical Parametric Oscillator", Fan et al., IEEE Journal of Quantum Electronics, vol. 25, No. 6, Jun. 1989, pp. 1196-1199.
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"Measurement of Ultrashort Optical Pulses with --BaB.sub.2 O.sub.4 ", Cheng et al., Appl. Phys. Lett. 52 (7), Feb. 15, 1988, pp. 519-521.
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"Visible BaB.sub.2 O.sub.4 Optical Parametric Oscillator Pumped at 355 nm by a Single-Axial-Mode Pulsed Source", Fan et al., Appl. Phys. Lett 53, No. 21, Nov. 21, 1988, pp. 2014-2016.
"Effect of Double Refraction on Type II Phase Matched Second Harmonic Generation", Mehendale et al., Optics Communications, vol. 68, No. 4, Oct. 15, 1988, pp. 301-304.
Cornell Research Foundation Inc.
Davie James W.
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