title: Tin diselenide as a new saturable absorber for generation of laser pulses at 1μm.
abstract: The nonlinear optical responses of two-dimensional (2D) few-layer tin diselenide (SnSe2) have been investigated in this work. By applying the Z-scan technique, the saturable absorption of SnSe2thin film has been observed at a wavelength of ~1μm, which enables SnSe2,a new saturable absorber for pulsed laser generation. A detailed exploration of the nonlinear absorption of SnSe2film and their dependence on excitation pulse energy is carried out. Our results show that saturation intensity of the nonlinear absorption is ~23.78 GW/cm2and corresponding nonlinear absorption coefficients are at a range from -13596 to -2967.3 cm/GW. By employing the SnSe2-coated mirror as a saturable absorber, the passively Q-switched lasing has been achieved on a crystalline waveguide platform at ~1 μm.
authors.forename: Chen
authors.initials: C
authors.lastname: Cheng
authors.forename: Ziqi
authors.initials: Z
authors.lastname: Li
authors.forename: Ningning
authors.initials: N
authors.lastname: Dong
authors.forename: Jun
authors.initials: J
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Chen