Ultrafast third-order optical nonlinearity in SnS2 layered compound for photonic applications

The experimental dependence of the third harmonic intensity ITH generated in SnS2 film on incident intensity IFH of the fundamental beam (λ = 1550 nm wavelength, ∼150 fs pulse duration, 80 MHz repetition rate) fitted by a third grade polynomial. The ultralow average power of TH beam is measured using a camera as ultra-sensitive powermeter. Inset: the image of the TH beam spot for IFH = 4.60 GW/cm2 and exposure time 0.96 ms.125