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Vanadium pentoxide (V 2 O 5 ) is the most stable phase among many transition metal vanadium oxides, and has already been widely used in many fields. In this study, the morphological, structural, and optical responses of V 2 O 5 film to ultrafast laser irradiation was investigated. The third-order nonlinear optical properties of V 2 O 5 film were measured by common Z-scan technique, and the results showed that V 2 O 5 film has self-defocusing and saturable absorption characteristics. The third-order nonlinear absorption coefficient and nonlinear refractive index were calculated to be -338 cm/GW and -3.62 × 10 -12 cm 2 /W, respectively. The tunable saturated absorption with modulation depth ranging from 13.8% to 29.3% was realized through controlling the thickness of vanadium pentoxide film. V 2 O 5 film was irradiated by ultrafast laser with variable pulse energy, and the morphological and structural responses of the V 2 O 5 to the laser with different energy densities were investigated. The irreversible morphological and structural responses of V 2 O 5 films to ultrafast laser irradiation was analyzed using the phase-contrast microscope and Raman spectrum. The chemical structure change from V 2 O 5 to V 6 O 13 was considered the main reason for refractive index modification.

Research on the Response Characteristics of Vanadium Pentoxide Film to the Irradiation of Ultrafast Pulsed Laser