Abstract

We demonstrate experimentally an enhanced intermodal four-wave mixing (FWM) process through coupling positively chirped femtosecond pulses into the deeply normal dispersion region of the fundamental mode of an in-house fabricated photonic crystal fiber (PCF). In the intermodal phase-matching scheme, the energy of the pump waves at 800 nm in the fundamental mode is efficiently converted into the anti-Stokes waves around 553 nm and the Stokes waves within the wavelength range of 1445–1586 nm in the second-order mode. The maximum conversion efficiency of ${\eta }_{\mathrm{as}}$ and ${\eta }_s$ of anti-Stokes and Stokes waves can be up to 21% and 16%, respectively. The Stokes frequency shift $\mathrm{\Omega }$ is $5580{\mathrm{cm}}^{-1}$. The fiber bending and intermodal walk-off effect of pulses do not have significant influence on the nonlinear optical process.

© 2015 Optical Society of America

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