Abstract
A Ti:Al2O3 laser is passively mode-locked with the use of an external cavity containing a nonlinear medium. No active modulation of the laser gain or loss is required for ultrashort pulse generation. The mode-locked output is a continuous train of chirped 2 ps pulses which may be dispersively compensated with a grating pair of obtain 560 fs pulses. For comparison purposes, the Ti:Al2O3 laser is actively mode-locked to obtain 60 ps pulses, and the pulses are shortened using the nonlinear external cavity to obtain chirped 2 ps pulses.
© 1989 Optical Society of America
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