Na. Borisevich et al., GENERATION OF FEMTOSECOND PULSES IN A SAP PHIRE-TITANIUM LASER WITH PULSED SYNCHRONOUS PUMP, Kvantovaa elektronika, 23(11), 1996, pp. 1003-1005
Femtosecond pulses were generated in a sapphire-titanium laser pumped
synchronously by the second harmonic of a pulsed neodymium phosphate-g
lass laser with passive mode locking and negative feedback. Such a las
er, combined with a regenerative amplifier, provided a simple, reliabl
e, and relatively inexpensive (compared with cw-pumped laser systems)
source of femtosecond pulses.