By coupling femtosecond pulses at λ – 1.55<i>μ</i>m in a short length (Z – 95 cm) of photonic crystal fiber, we observe the simultaneous generation of two visible radiation components. Frequency-resolved optical gating experiments combined with analysis and modal simulations suggest that the mechanism for their generation is third-harmonic conversion of the fundamental pulse and its split Raman self-shifted component.
© 2001 Optical Society of America
(060.7140) Fiber optics and optical communications : Ultrafast processes in fibers
(320.5550) Ultrafast optics : Pulses
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7140) Ultrafast optics : Ultrafast processes in fibers
Fiorenzo G. Omenetto, Antoinette J. Taylor, Mark D. Moores, Jesus Arriaga, Jonathan C. Knight, William J. Wadsworth, and Philip St. J. Russell, "Simultaneous generation of spectrally distinct third harmonics in a photonic crystal fiber," Opt. Lett. 26, 1158-1160 (2001)