Single-frequency operation of a cw pumped Nd:YAG laser was achieved by using a ring cavity configuration containing a small differential loss. The resulting unidirectional traveling wave eliminated spatial hole burning, and the output of the laser was at a single frequency.

We report the passive mode locking of a repetitively pulsed Nd:YAG laser in which complete mode-locking is established by the 100% modulation of the output pulse train and a two-photon fluorescence pulse width measurement yielding a contrast ratio of 3:1.

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