Abstract
We report what are to our knowledge the first observation and characterization of quadratic spatial solitons in periodically poled lithium niobate (PPLN). Using an Nd:YAG (1064 nm) source, we observed self-trapped solitary-wave propagation over more then six diffraction lengths as a result of the cascaded quadratic non linear process. Low-threshold operation was measured for the quasi-phase-matched PPLN structure designed for frequency doubling.
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