2-mu m passive Q-switched Tm:YAP laser with SnSe2 absorber

Few-layer SnSe2 was successfully fabricated by liquid phase exfoliation method. A passive Q-switched Tm:YAP laser at the wavelength of 1940 nm was demonstrated by using SnSe2 saturable absorber (SA). Under absorbed pump power of 4.9 W, 400 mW Q-switched was achieved with the pulse width of 1.29 mu s and the repetition rate of 109.77 kHz. The results indicate the promising potential of SnSe2 nanosheets as SA to achieve efficient pulsed lasers at around 2 mu m. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)