Mode locking of a laterally UV prelonized discharge XeC1 laser
has been obtained by using a phase conjugate mirror as full reflector
in the laser cavity. The phase conjugate mirror via stimulated Brilbum
scattering presents a time dependent reflectivity. It acts as a
modulator and provides amplitude modulation at the cavity round trip
time. An output beam made of 5 short pulses separated by 10 nsec has
been obtained. The shortest pulse is 2 nsec FWHM long.