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Efficient anti-Stokes generation through phase-matched four-wave mixing in higher-order modes of a microstructure
D A Akimov1, E E Serebryannikov, A M Zheltikov
1Physics Department, International Laser Center, M. V. Lomonosov Moscow State University, 119899 Moscow, Russia.
Optics Letters
|November 1, 2003
Abstract:
Phase-matched four-wave mixing in higher-order modes of microstructure fibers allows unprecedentedly high efficiencies of anti-Stokes frequency conversion to be achieved for subnanojoule femtosecond laser pulses. 70-fs pulses of 790-nm radiation were used to generate an anti-Stokes component at 520-530 nm in a higher-order mode of a microstructure fiber with a 4.8-microm core. The maximum ratio of the anti-Stokes signal energy to the energy of the pump component in the output spectrum is estimated as 1.7.