Narrow linewidth BBO optical parametric oscillator utilizing ext

Details Narrow linewidth BBO optical parametric oscillator utilizing ext Narrow linewidth BBO optical parametric oscillator utilizing ext

1994-03-30

1995-04-11

Lee, John D.

Optical: systems and elements

Optical frequency converter

Parametric oscillator

372 21, G02F 139

Patent

active

054064090

ABSTRACT:
Optical parametric oscillators using non-linear crystals cut for the type I interaction have an extraordinary pump beam which generates ordinary signal and idler beams. The use of an optical element to rotate the signal beam before sending this signal beam to a grating element allows for the grating element to have its dispersion plane oriented coplanar with the extraordinary crystal plane of the non-linear crystal. In this manner, for non-linear crystals which have relatively narrow acceptance angles, such as BBO crystals, the reduction in angular aperture of the parametric gain in the extraordinary plane will produce a reduction in the linewidth of the produced output. The grating translates the angular variations into variations in wavelength. If no rotator was used in the optical parametric oscillator, then in order to get the maximum efficiency out of the grating, the dispersion plane of the grating should be orthogonal to the extraordinary plane of the crystal, and therefore the narrow angular acceptance of the crystal would not result in a narrow output linewidth.

REFERENCES:
patent: 3670258 (1972-06-01), Magnante
patent: 4784450 (1988-11-01), Jain et al.
patent: 5134622 (1992-07-01), Deacon
patent: 5333142 (1994-07-01), Scheps
Brosnan, Stephen J. and Robert L. Byer; "Optical Parametric Oscillator Threshold and Linewidth Studies"; IEEE Journal of Quantum Electronics; vol. QE-15, No. 6; Jun. 1979; pp. 415 14 431.

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