Abstract

By coupling femtosecond laser pulses at a wavelength of $\sim 0.8\mathrm{\mu }\mathrm{m}$ in high-delta microstructure fiber, efficient blueshifted radiation with a central wavelength near $0.4\mathrm{\mu }\mathrm{m}$ was observed. The blue light can take 15% of output power. The mechanism for its generation is analyzed to be a degenerate parametric process $2{\omega }_p={\omega }_s+{\omega }_i$, where the frequency of the signal light ${\omega }_s$ is nearly twice the pump frequency ${\omega }_p$, and the frequency of the idler light ${\omega }_i$ can lie in the terahertz region.

© 2008 Optical Society of America

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