Passively Q-switched Tm:KYW laser with Cr:ZnSe saturable absorber

We present a compact diode-pumped Tm:KYW laser passively Q-switched with polycrystalline Cr:ZnSe saturable absorber. The laser operates at around 1910 nm and 1940 nm and produces pulses with duration as short as 10 ns and energy up to 40 μJ.