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Opt Lett. 1999 Oct 15;24(20):1410-2.

Observation of quadratic spatial solitons in periodically poled lithium niobate.

Abstract

We report what are to our knowledge the first observation and characterization of quadratic spatial solitons in periodically poled lithium niobate (PPLN). Using a Nd:YAG (1064-nm) source, we observed self-trapped solitary-wave propagation over more than six diffraction lengths as a result of the cascaded quadratic nonlinear process. Low-threshold operation (5-kW peak power) was measured for the quasi-phase-matched PPLN structure designed for frequency doubling.

PMID:
18079818
[PubMed]
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