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DEVELOPMENT OF SHORT PULSE BROADBAND AND TUNABLE NARROW- LINEWIDTH ULTRAVIOLET LASERS USING Ce:LiCAF CRYSTAL

We report the development of all-solid state lasers based on Ce:LiCaAlF6 (or Ce:LiCAF) crystal as gain medium. These Ce:LiCAF lasers are pumped by 7 ns pulses at 10 Hz from the fourth harmonics (266 nm) of a Q-switched Nd:YAG laser. The effects of output coupler reflectivity, resonator length and pump energy on the Ce:LiCAF laser characteristics were explored. With the broadband laser configuration, the Ce:LiCAF laser achieved a maximum output pulse energy of 3.4 mJ and a laser slope efficiency of about 33%. Single UV laser pulses of 450 ps were generated by controlled resonator transient. With the narrow linewidth laser configuration, tunability of the Ce:LiCAF laser emission from 281 nm to 299 nm is obtained maintaining a linewidth narrower than 0.2 nm. The laser emissions are suitable for spectroscopic and environmental sensing applications.