Abstract
Vanadium pentoxide (V2O5) 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 V2O5 film to ultrafast laser irradiation was investigated. The third-order nonlinear optical properties of V2O5 film were measured by common Z-scan technique, and the results showed that V2O5 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 cm2/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. V2O5 film was irradiated by ultrafast laser with variable pulse energy, and the morphological and structural responses of the V2O5 to the laser with different energy densities were investigated. The irreversible morphological and structural responses of V2O5 films to ultrafast laser irradiation was analyzed using the phase-contrast microscope and Raman spectrum. The chemical structure change from V2O5 to V6O13 was considered the main reason for refractive index modification.
Highlights
Vanadium oxides are known to have the unique property of semiconductor–metal reversible phase transitions during long-pulsed laser irradiation, having a wide range of potential applications in optical, electronic, and photoelectric devices [1]
There are more than ten stoichiometric formulae for vanadium oxides from the lowest VO phase to the highest V2 O5 phase [2]
Was transferred to the material, which induced a series of refractive index modificationAs shown in Figure 6, the results show peaks at 104, 147, 197, 284, 380, 418, 416, 530, related processes, such as excitation and recombination
Summary
Vanadium oxides are known to have the unique property of semiconductor–metal reversible phase transitions during long-pulsed laser irradiation, having a wide range of potential applications in optical, electronic, and photoelectric devices [1]. There are more than ten stoichiometric formulae for vanadium oxides from the lowest VO phase to the highest V2 O5 phase [2]. Since the vanadium atom in V2 O5 has the highest valence, V2 O5 possesses the most stable chemical properties among these vanadium oxides. V2 O5 has a reversible first-order phase transition property, and its phase transition temperature is about 257 ◦ C [3]. V2 O5 has a unique layered structure, which makes it a very promising material.
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