The Applied Research On Photo-induced Birefringence Of Azo Dye-doped Polymer Films

Study of methyl orange (MO) the azo dye-doped polyvinyl alcohol (PVA) thin film nature of the photo-induced birefringence and optical properties of birefringence in optical switch ,optical storage and optical modulator applications.The use of semiconductor laser (473nm) as excitation light, He-Ne laser (632.8nm) as a probe to study film of different dye concentration of photo-induced birefringence, with the increase in dye concentration, thin film samples the degree of photo-induced birefringence response increased. Photo-induced birefringence of optical power and motivate, stimulate and detect the direction of light polarization direction of optical polarization angle, the relationship between the excitation frequency. The same sample, the same excitation light polarization direction and angle to detect the direction of light polarization, the sample birefringence response Photoluminescence excitation light intensity with the increase; the same sample, the same excitation light intensity, the samples of photo-induced double - refraction of light reflected in the polarization direction of excitation and detection of light polarization direction to achieve the best angle too; the same sample under the same conditions, the reaction of photo-induced birefringence and the degree of excitation light to stimulate a positive correlation between the number, that is, the frequency of excitation light irradiation more number of samples of photo-induced birefringence effect of the response the more remarkable.The use of photo-chromic dyes also studied the characteristics of birefringence optical switch, optical storage and optical modulator applications. For the same sample, we are excited to their different optical power in the optical switch was studied. As the optical power was found to stimulate the increase of optical switches to reduce the response time, modulation depth increases; and excited at the same optical power through outside Singapore can play a larger piece of the purpose of modulation depth. In optical storage, we realized the film samples to use its photo-induced birefringence characteristics of the temporary storage, the storage time up to 3.5 hours. We also verify the azo dyes according to their characteristics of light-induced birefringence in the optical modulator has a wide application prospect.