Abstract

Generation of spectrally-isolated wavelengths in the violet to blue region based on cascaded degenerate four-wave mixing (FWM) is experimentally demonstrated for the first time in a tailor-made photonic crystal fiber, which has two adjacent zero dispersion wavelengths (ZDWs) at 696 and 852 nm in the fundamental mode. The influences of the wavelength ${\lambda }_{\mathrm{p}}$ and the input average power $P_{\mathrm{av}}$ of the femtosecond pump pulses on the phase-matched frequency conversion process are studied. When femtosecond pump pulses at ${\lambda }_{\mathrm{p}}$ of 880, 870, and 860 nm and $P_{\mathrm{av}}$ of 500 mW are coupled into the normal dispersion region close to the second ZDW, the first anti-Stokes waves generated near the first ZDW act as a secondary pump for the next FWM process. The conversion efficiency ${\eta }_{\mathrm{as}2}$ of the second anti-Stokes waves, which are generated at the violet to blue wavelengths of 430, 456, and 472 nm, are 4.8, 6.48, and 9.66%, for ${\lambda }_{\mathrm{p}}$ equalling 880, 870, and 860 nm, respectively.

© 2016 Optical Society of America

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