Ultraviolet optical pulses were generated by actively mode locking an exter
nal cavity InGaN laser at a wavelength of 409 nm with a temporal pulse dura
tion of 30 ps. The average power was 2 mW and the time-bandwidth product wa
s 1.2. Dynamic detuning plays a major role in pulse development. (C) 2001 A
merican Institute of Physics.