Nonlinear cascaded femtosecond third harmonic generation
was experimentally investigated pumped by 100 fs pulses at optical
communication band 1550 nm using a multi-grating 5 mol. % MgO-doped
periodically poled lithium niobate crystal. The optimized efficiency of 10.8%
was achieved with the simultaneous phase-matching of the second harmonic and
sum frequency process. And the third harmonic spectrum reached as broad as 8.7
nm because of the choosing of a small group velocity mismatching between the
fundamental and second harmonic pulses. Nonlinear cascaded method will provide
a reference for the efficient frequency conversion in the high intensity range.
Cite this paper
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