Steady-state ultrashort pulses generated by passive mode locking of a solid-state laser with an active feedback

Reproducible generation of steady-state ultrashort pulses (of ~ 7.4 psec duration) was achieved for the first time in a pulsed ruby laser with passive mode locking.The lasing was stabilized by a slow-response negative feedback established by an electrooptic switch.An experimental study was made of the formation of steady-state ultrashort pulses from initial radiation fluctuations.The proposed method should be suitable for the generation of reproducible pulses of ~ 100 fsec duration in wide-band amplifying media.

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