An analysis of passive mode locking with the intracavity self-focusing effect is presented, and the self-starting issue is addressed. The analysis shows that the initial pulse-shortening force of this mechanism is too weak to start the mode locking from mode beating or noise and how it can be greatly enhanced with a dilute dye saturable absorber in the cavity. This analysis also shows how the pulse-width evolution is related to the pulse-shortening force in cw mode-locking lasers.
© 1991 Optical Society of America
Original Manuscript: July 3, 1991
Published: November 1, 1991
Szuyuan Chen and Jyhpyng Wang, "Self-starting issues of passive self-focusing mode locking," Opt. Lett. 16, 1689-1691 (1991)