title: Pulse colliding in a self-mode-locked ring-cavity ti:sapphire laser.
abstract: 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.
authors.forename: C Y
authors.initials: CY
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Chai
authors.forename: W
authors.initials: W
authors.lastname: Zhang
authors.forename: K M
authors.initials: KM
authors.lastname: Yoo