Fig. 1. (a) Refractive index of the prepared chalcogenide glass(Ge_xAs_40−xSe₄₀Te_20,x=0, 10, 20, 30, 40) at 2-20 μm; (b) Absorption spectra of Ge_xAs_40−xSe₄₀Te₂₀ chalcogenide glass; (c) T_g of the glass as a function of Ge content

Fig. 2. (a) 2D optical microscope images at different average powers at 800 nm; (b) 3D mode; (c) LIDT linear fitting result at 800 nm

Fig. 3. (a) 2D optical microscope images with different wavelengths and average powers; (b) 3D view; (c) SEM of damage morphology; (d) LIDT results with different wavelengths

Fig. 4. (a) SEM image of damage morphology of different pulse numbers at 800 nm; (b) LIDT changes with the laser pulse number, illustrations for the logarithmic display

Fig. 5. (a) Optical microscope image of damage by 800 nm femtosecond laser with different repetition frequencies; (b) Ge₃₀As₁₀Se₄₀Te₂₀ LIDT changes with different repetition frequencies from 1 Hz to 1 kHz

Fig. 6. (a) Raman spectra of Ge_xAs_40−xSe₄₀Te₂₀ glasses. The solid line is the original Raman spectrum，and dashed line is after femtosecond laser processing; (b) Deconvoluted Raman spectra of Ge_xAs_40-xSe₄₀Te₂₀ glasses