QUANTUM-NOISE REDUCTION IN TRAVELING-WAVE QUASI-PHASE-MATCHED 2ND-HARMONIC GENERATION

The present calculation on squeezing capabilities of quadratic nonline ar media in which the phase matching condition is achieved artificiall y by a periodic poling of the nonlinear susceptibility shows that inte resting performance can be obtained for highly integrable and nonlinea r materials, using technologies already developed. The origin of squee zing in quasi-phase matched (QPM) media is the cascading of two second order nonlinearities, which at small second harmonic conversion rates has properties similar to a more familiar, purely third order nonline ar effect - Kerr effect.