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An azo dye functionalized sol–gel material has been designed and synthesized to possess photochromism under a green laser beam illumination control. 10-mW laser illumination with a spot size of 1mm 2 at 532nm wavelength on the film material was found to result in 6×10 −4 change in material refractive index. The response time of the material photochromism is around 50ms (3-dB modulation...
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