Transform-limited ultrashort green and infrared light pulses have been generated from a Nd:YAG laser mode locked by an intracavity second-harmonic crystal in combination with a dichroic output coupler. The mode-locking process is based on substantial reconversion of the second-harmonic radiation back into fundamental radiation after reflection by the dichroic mirror. With this technique light pulses as short as 45 psec have been generated.
© 1989 Optical Society of America
Krassimir Stankov, "Mode locking by a frequency-doubling crystal: generation of transform-limited ultrashort light pulses," Opt. Lett. 14, 359-361 (1989)