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Optimum focusing conditions for parametric gain in crystals with double refraction

1972; American Institute of Physics; Volume: 21; Issue: 12 Linguagem: Inglês

10.1063/1.1654260

1520-8842

D. Kuizenga,

Photonic and Optical Devices

In a uniaxial crystal, walk-off or double refraction occurs only in the plane of the direction of propagation and the optic axis. By elliptical focusing of the signal, idler, and pump we can focus much more tightly in the non-walk-off plane and increase parametric gain considerably. Optimum focusing conditions are obtained, and in a typical LiNbO3 oscillator pumped with 1.06 μ we find that threshold can be lowered more than a factor of 5.