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Bandwidth and threshold calculations for angle-tuned parametric oscillators

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2 Author(s)
Basu, R. ; Dept. of Electrical Engineering, University of Southern California, Los Angeles, CA, USA ; Steier, William H.

The bandwidth of angle-tuned optical parametric oscillators, in some cases, is limited by the noncolinear interaction of the pump, signal, and idler beams, which results when the non-linear material is rotated relative to the pump beam. The decreased beam overlap reduces the parametric gain and increases the pump power threshold. To determine this bandwidth, a theoretical expression for the threshold is derived in the near field limit taking into account double refraction for a noncolinear interaction. Angle tuning can be done by 1) rotating the crystal and mirrors as a unit, or by 2) rotating the crystal only. Expressions for determining the tuning rate and threshold increase for both tuning methods are derived. Angle tuning about the 90° phase-matching axis in LiNbO3(the low-threshold design) is shown to be not practical. A combination of step temperature tuning and voltage fine tuning is found to be most practical in this case. A wide-band oscillator with a small threshold increase is shown to be possible by angle tuning about an axis not parallel to a crystal axis. The threshold increases very little if the oscillator is tuned by rotating only the crystal inside an optical cavity made of one curved and one flat mirror.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:8 ,  Issue: 8 )