We demonstrate efficient spectral compression of femtosecond pulses near the zero-dispersion wavelength in nonlinear photonic crystal fibers (PCFs). The highest measured compression factor is 21, in which case the spectral brightness increases by a factor of 5. We numerically model the pulse propagation and find good agreement with the experiment. We argue that the fibers studied allow for spectral narrowing of more than 2 orders of magnitude. With dispersion-shifted PCFs, efficient spectral compression can take place across the visible and near-infrared part of the spectrum.
© 2005 Optical Society of America
Esben Ravn Andresen, Jan Thøgersen, and Søren Rud Keiding, "Spectral compression of femtosecond pulses in photonic crystal fibers," Opt. Lett. 30, 2025-2027 (2005)