Injection locking of a diode-pumped Nd:YAG laser at 946 nm

Injection locking in the quasi-three-level laser system Nd:YAG (4)F(3/2)-(4)I(9/2) at 946 nm is reported. The master and slave oscillators are pumped by laser diodes. The master oscillator is frequency stabilized to a high-finesse cavity, resulting in a laser linewidth of less than 10 Hz. Using intracavity frequency doubling of the slave oscillator, we achieve a single-mode output power of 60 mW at 473 nm. The laser radiation was frequency quadrupled, resulting in an UV power of 0.55 mW at 236.5 nm. The laser system was used to excite a strongly forbidden In(+) transition, proposed as a new optical frequency standard.