5.1Introduction to Quasi-Phase Matching
This chapter presents a strategy for phase-matching waves that does not require crystal birefringence. The technique, called quasi-phase matching (QPM), was proposed even before birefringent phase matching (Armstrong et al., 1962), but due to technical difficulties in fabricating samples, QPM was not achievable at the time. The more direct method of birefringent phase matching was the first to be widely implemented. Both techniques are now found in a wide range of applications.
Quasi-phase-matched techniques periodically reset the phase of the nonlinear polarization to maintain a coherent buildup of the nonlinear interaction. The most common mechanism for rephasing is via the crystal’s ...
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