By coupling femtosecond laser pulses at a wavelength of in high-delta microstructure fiber, efficient blueshifted radiation with a central wavelength near was observed. The blue light can take 15% of output power. The mechanism for its generation is analyzed to be a degenerate parametric process , where the frequency of the signal light is nearly twice the pump frequency , and the frequency of the idler light can lie in the terahertz region.
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