title: Dynamic optical limiting experiments on vanadium dioxide and vanadium pentoxide thin films irradiated by a laser beam.
abstract: Vanadium dioxide (VO2) and vanadium pentoxide (V2O5) 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 W/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 approximately 200 ms; the laser beam transmittance of the V2O5 film decreases from 51% before phase transition to 24% after phase transition, and the response time is approximately 40 ms. The optical limiting is realized by this laser heating-induced phase transition.
authors: Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang, China. wwpwzx@yeah.net
authors: Weiping
authors: W
authors: Wang
authors: Yongquan
authors: Y
authors: Luo
authors: Dayong
authors: D
authors: Zhang
authors: Fei
authors: F
authors: Luo