A group-velocity mismatch compensation technique has been applied to cw Nd:YAG and Nd:YLF lasers mode locked by use of the nonlinear ref lectivity or the nonlinear phase shift that arises from the intracavity parametric interaction of a pulse with its second harmonic. An intracavity birefringent plate, which delays the fundamental wavelength pulse with respect to the second-harmonic pulse, compensates for the opposite effect that arises in the second-harmonic crystal. Compensation reduces the pulse duration by a factor of 2 and allows pulses of 5.1 and 5.9 ps to be obtained from Nd:YLF and Nd:YAG lasers, respectively.
© 1995 Optical Society of America
G. Cerullo, V. Magni, and A. Monguzzi, "Group-velocity mismatch compensation in continuous-wave lasers mode locked by second-order nonlinearities," Opt. Lett. 20, 1785-1787 (1995)