Fig. 1. Experimental set-up of SnSe2 PQS SFD laser. 1, SFD crystal; 2, SnSe2 SA; 3, output mirror; 4, filter; 5, beam splitter; 6, power meter; 7, oscilloscope.

Fig. 2. a, The SnSe2-PVA dispersion solution. b, The SA with SnSe2-PVA thin film.

Fig. 3. Transmission spectra of SnSe2 SA and blank quartz substrate.

Fig. 4. Transmittance variation of SnSe2 SA with incident power intensity of 1064 nm.

Fig. 5. PQS SFD laser characteristics of Nd:YCOB crystal with SnSe2 as SA. a, Output powers of cw and PQS lasers. b, Pulse width and repetition rate. c, Single pulse energy and peak power. d, Pulse train with a repetition rate of 17.6 kHz and single pulse waveform with a width of 91.9 ns.

Fig. 6. PQS SFD laser characteristics of Nd:GdCOB crystal with SnSe2 as SA. a, Output powers of cw and PQS lasers. b, Pulse width and repetition rate. c, Single pulse energy and peak power. d, Pulse train with a repetition rate of 22.1 kHz and single pulse waveform with a width of 48.7 ns.