We demonstrate that quasi-phase-matching of the third-harmonic generation process can be obtained for a pulse pump in the photonic crystal fiber with a refractive-index grating. Conversion efficiency is calculated numerically using a system of coupled generalized nonlinear Schrödinger equations. We propose a special design of the microstructured fiber for the third-harmonic generation and analyze different phenomena limiting the maximum efficiency for short (femtosecond) and long (picosecond) pump pulses. Moreover, we show that a certain level of a group-velocity mismatch between the pump and the third harmonic can increase the maximum efficiency in the long pulse regime.
© 2011 Optical Society of America
Original Manuscript: April 5, 2011
Revised Manuscript: June 24, 2011
Manuscript Accepted: July 4, 2011
Published: August 5, 2011
Karol Tarnowski, Bertrand Kibler, and Waclaw Urbanczyk, "Grating-assisted third-harmonic generation in photonic crystal fibers using a pulse pump," J. Opt. Soc. Am. B 28, 2075-2080 (2011)