Abstract
Efficient nonlinear frequency conversion requires phase matching, without which light generated at different positions interferes destructively. In second harmonic generation (SHG), where a fundamental frequency (FF) ω is doubled to 2ω in a nonlinear medium, phase matching demands k2ω=2kω, with kω,2ω the wave vectors of the FF, SH. Because of dispersion, phase matching requires deliberate design: in quasi-phase matching (QPM), the nonlinearity is made to vary periodically; in birefringent phase matching the birefringence balances the dispersion [1].
© 2015 IEEE
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