Fig. 1. MgF₂/Lumogen composite membrane preparation process

Fig. 2. The 1064 nm laser damages the system optical path

Fig. 3. Three kinds of laser irradiation scheme for MgF₂/Lumogen composite membrane

Fig. 4. Vacuum ultraviolet fluorescence spectra of composite films before and after irradiation with laser power of 1 W,（b）3 W and 5 W at different rates

Fig. 5. The near-ultraviolet fluorescence spectra of the composite films before and after irradiation with laser power at different rates

Fig. 6. The transmission spectra of composite films before and after irradiation with different laser power at different rates

Fig. 7. The（a）vacuum ultraviolet fluorescence spectra,（b）near-ultraviolet fluorescence spectra and（c）transmittance spectra of Lumogen film and MgF₂/Lumogen composite film under the same irradiation conditions

Fig. 8. Thermal diffusion diagram of MgF₂/Lumogen composite film