Anti-laser Irradiation Ability of VO₂ Films Against Pulsed Power Laser

Thermochromic VO2 film was fabricated on quartz substrate through sputtering oxidation coupling method, and its optical properties were also investigated. Results show that the prepared VO2 film exhibits good thermo-optical switching performance under weak light irradiation, while large transmittance changes both in the visible and near-infrared light area. Under the condition of pulsed power laser irratiating, large optical modulation depth is also derived in the infra-red region. With the increase of pulsed laser energy, the scattering coefficient is gradually decreased, and the anti-laser irradiation ability is firstly appeared to have a decline trend after an initial ascent. The minimum transmittance value can reach to 7% and the laser damage threshold is about 50 mJ/cm2.