Resonantly pumped acousto-optic Q-switched Er:YAG lasers at 1617 and 1645 nm

Resonantly pumped acousto-optic Q-switched Er:YAG lasers at 1617 and 1645 nm are demonstrated. An etalon was used to obtain 1617 nm output. Laser pulses with 4.02 mJ energy at 1617 nm and 5.64 mJ energy at 1645 nm were generated, with pulse duration more than 400 ns at a pulse repetition rate of 1000 Hz.