Parameter ranges for ultrahigh frequency mode locking of semiconductor lasers

The inclusion of an intracavity saturable absorber for ultrahigh-frequency passive mode locking of semiconductor lasers also produces intensity self-pulsation in many instances. We examined experimentally and theoretically the deleterious effect of self-pulsation on ultrahigh-frequency mode locking, and arrived at the conclusion that lasers with high reflectivity coatings can most reliably achieve mode locking without being adversely affected by self-pulsation.