Investigation of the influence of photobleaching process on the thermo-optic coefficient of disperse red 1/poly(methl methacrylate) film

The influence of photobleaching process on the thermo-optic coefficient (dn/dT) of disperse red 1/poly(methl methacrylate) film is investigated by using the attenuated total reflection technique. Experimental results show that the absolute values of the thermo-optic coefficient of fully bleached disperse red 1/poly(methl methacrylate) film are smaller than those of unbleached film. Moreover, the absolute value of anisotropy of the thermo-optic coefficient (dnTE/dnTM/dT) also decreases after the disperse red 1/poly(methl methacrylate) film that is fully bleached.