Abstract
By coupling femtosecond laser pulses at a wavelength of ~0.8 μm in high-delta microstructure fiber, efficient blueshifted radiation with a central wavelength near 0.4 μm was observed. The blue light can take 15% of output power. The mechanism for its generation is analyzed to be a degenerate parametric process 2ωp=ωs+ωi, where the frequency of the signal light ωs is nearly twice the pump frequency ωp, and the frequency of the idler light ωi can lie in the terahertz region.
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