We demonstrate self-phase modulation (SPM) spectral broadening in two-dimensional solitons in homogeneous media using two different schemes. In the active mode, a train of pulses are collectively trapped and form a spatial soliton through a photorefractive, slowly responding, and electronically controlled self-focusing nonlinearity, and each pulse experiences spectral broadening by the fast SPM nonlinearity. In the passive mode, the pulse-train beam is guided in a waveguide that is optically induced by a continuous-wave thermal spatial soliton. The soliton formation increased the normalized spectral broadening factor from 0.5% up to 197%. This experiment presents significant progress toward the experimental demonstration of three-dimensional spatiotemporal pulse-train solitons.
© 2012 Optical Society of America
Original Manuscript: September 10, 2012
Revised Manuscript: November 19, 2012
Manuscript Accepted: November 20, 2012
Published: December 12, 2012
Oren Lahav, Hassid Gurgov, Pavel Sidorenko, Or Peleg, Liad Levi, Avner Fleischer, and Oren Cohen, "Self-phase modulation spectral broadening in two-dimensional spatial solitons: toward three-dimensional spatiotemporal pulse-train solitons," Opt. Lett. 37, 5196-5198 (2012)