Diode pumped all-solid-state pulsed 589 nm laser

A DL-pumped Nd:YAG all-solid-state sum-frequency laser is presented. Efficient sum-frequency mixing 1 064 nm and 1 319 nm in a 6 mm×6 mm×12 mm KTP crystal is obtained by extra-cavity sum-frequency. Type Ⅱ critical phase-match(CPM) is realized by controlling the temperature of the KTP crystal. By injecting 3.05 W and 2.46 W of 1 064 nm and 1 319 nm Q-switched radiation, respectively, into the KTP crystal, 1.3 W of sum-frequency maximum output is generated with a pulse repetition rate of 400 Hz and pulse duration of about 35 ns, narrowband less than 3 GHz,efficiency up to 23.5%.The beam quality factor of 589 nm laser was 1.84,1.93 in parellel and perpendicular direction, respectively. Experimental results show that the extra-cavity sum-frequency mixing is an effective method for obtaining