We experimentally demonstrate strong second-harmonic-generation from a self-induced all-optical poling in germanium-doped fiber with a subnanosecond laser pump at 1064 nm. The large second-harmonic conversion efficiency allows nonlinear spectral broadening at visible wavelengths so that up to nine distinct Raman sidebands have been obtained. In this work we emphasize how the Raman scattering, induced from the pump in the IR region, can drastically affect the optical poling effect, limiting in turn second-harmonic generation.
© 2010 Optical Society of America
Original Manuscript: September 4, 2009
Revised Manuscript: November 24, 2009
Manuscript Accepted: November 26, 2009
Published: January 12, 2010
Vincent Couderc, Alessandro Tonello, Christelle Buy-Lesvigne, Philippe Leproux, and Ludovic Grossard, "Unprecedented Raman cascading and four-wave mixing from second-harmonic generation in optical fiber," Opt. Lett. 35, 145-147 (2010)