We demonstrate that, for tilted pulses, the contribution to group velocity that is due to spatial walk-off can compensate for the group-velocity mismatch in three-wave interactions. With 100-fs, 0.4-μm pump pulses in β-barium borate, we obtained efficient parametric generation of collinear superfluorescence tunable in the range from 0.456 to 3.25 μm.
© 1996 Optical Society of America
R. Danielius, A. Piskarskas, P. Di Trapani, A. Andreoni, C. Solcia, and P. Foggi, "Matching of group velocities by spatial walk-off in collinear three-wave interaction with tilted pulses," Opt. Lett. 21, 973-975 (1996)