Abstract

Vanadium dioxide $\left({\text{VO}}_{\text{2}}\right)$ and vanadium pentoxide $\left({\text{V 2}}_{}{\text{O 5}}_{}\right)$ thin films are irradiated by a near-infrared continuous-wave laser beam and the dynamic optical limiting performance is measured. The temperature varying with time of the films induced by a laser beam is also recorded by an IR thermal sensor. Under the irradiation of a laser beam with an intensity of $255\text{W}/{\text{cm}}^{\text{2}}$ and a spot diameter of $2\text{\hspace{0.17em} mm}$, the laser beam transmittance of the ${\text{VO}}_{\text{2}}$ film decreases from $47\%$ before phase transition to $28\%$ after phase transition, and the response time is $\sim 200\text{\hspace{0.17em} ms}$; the laser beam transmittance of the ${\text{V 2}}_{}{\text{O 5}}_{}$ film decreases from $51\%$ before phase transition to $24\%$ after phase transition, and the response time is $\sim 40\text{\hspace{0.17em} ms}$. The optical limiting is realized by this laser heating-induced phase transition.

© 2006 Optical Society of America

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