Abstract
A quadratic spatial soliton (QSS) is a multi-frequency beam that is self-trapped due to efficient coupling between its different frequency components via a second order nonlinear interaction such as second harmonic generation (SHG). Since the first experiment on quadratic spatial soliton,1 the lowest QSS excitation thresholds have been obtained in periodically poled (QuasiPhase-Matched, QPM) LiNbO3 (PPLN).2 QPM has become a powerful tool for obtaining efficient optical frequency conversion due to the fabrication of periodically poled ferroelectric crystals.3 It leads to large, useable, effective second order coefficients for soliton generation with low QSS thresholds, large angular bandwidth and no walkoff, all superior to the best birefringence phase-matched crystals. However, photorefractive damage in PPLN requires operation at temperatures of ~ 100°C. Here we report on the generation of single and multiple QSS’es in a different periodically poled ferroelectric which does not exhibit significant photorefractive damage and hence can be operated at room temperature, namely biaxial KTP (PPKTP, deff = 11 pm/V).
© 2002 Optical Society of America
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