Abstract
Distinguishability and spatial separation of the interacting waves in nonlinear optical devices can be difficult. This problem can be solved for some material systems by using interacting waves with orthogonal polarizations (type II phase-matching). However, this approach generally precludes use of the largest nonlinear coefficient, and is incompatible with well-developed material systems such as proton exchanged waveguides in lithium niobate, which guide only one polarization. An alternative approach is quasi-phase-matching (QPM) using odd and even waveguide modes for the interacting waves; these modes can be filtered or separated with integrated optical components. Although QPM usually involves the fundamental modes of the interacting wavelengths in waveguide nonlinear optics, the technique can also be applied to mixing involving higher-order modes, as demonstrated here.
© 2002 Optical Society of America
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