Dynamic gain induced pulse shortening in Q-switched lasers.
We describe a novel mechanism of pulse shortening in a Q-switched laser induced by the gain compression effect under strong pumping conditions. The pulse shortening requires a large variation of the gain excursion during the saturation process and benefits from the large volume of the gain medium. The effect has been experimentally demonstrated using a passive Q-switched Tm/Ho-doped fiber laser that shows gain-induced pulse compression from 800 ns down to 160 ns when the pump threshold is exceeded by 15 times.
Herda
Robert
R
Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, Tampere 33101, Finland. robert.herda@toptica.com
Kivistö
Samuli
S
Okhotnikov
Oleg G
OG