A new self-mode-locked ring-cavity Ti:sapphire laser is described that is self-mode locked in both unidirectional and bidirectional operations. We found that clockwise and counterclockwise pulses collide with each other at the Ti:sapphire rod when the laser is mode locked in a bidirectional operation. Spectrum narrowing and pulse broadening were found in bidirectional rather than unidirectional mode-locked operation. This is explained by the performance of a transient grating in the gain medium that restricts oscillation to a narrow spectral range.
© 1998 Optical Society of America
Original Manuscript: March 17, 1997
Revised Manuscript: July 21, 1997
Published: January 20, 1998
Ching-yue Wang, Lu Chai, Weili Zhang, and Kwong Mow Yoo, "Pulse colliding in a self-mode-locked ring-cavity Ti:sapphire laser," Appl. Opt. 37, 522-525 (1998)