Abstract

Vanadium dioxide (VO2) and vanadium pentoxide (V 2O 5) 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 255W/cm2 and a spot diameter of 2  mm, the laser beam transmittance of the VO2 film decreases from 47% before phase transition to 28% after phase transition, and the response time is 200  ms; the laser beam transmittance of the V 2O 5 film decreases from 51% before phase transition to 24% after phase transition, and the response time is 40  ms. The optical limiting is realized by this laser heating-induced phase transition.

© 2006 Optical Society of America

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