Abstract:  The al- l optical switching polymer composites with poly（vinyl carbazole） as the main material and azobenzene dyes including DR-1‚DR-13and DY-7as the object materials were successfully prepared by the adulteration method．An excellent al- l optical switching effect driven by the pump beam with low power （12．5～30mW‚514nm） had been observed during the light -responding measure．At the same time‚the influencing factors of the al- l optical switching effect‚such as the modulation frequency of pump beam‚the content and the structure of chromophores‚were comparatively studied．It is shown that‚in the same experimental condition‚the al- l optical switching effect will be enhanced with the increasing of chromophore molecular polarity．Higher chromophore content （20％） makes the al- l optical switching effect stronger‚and the effect under lower modula-tion frequency （30Hz） is stronger than that under higher modulation frequency （50Hz）．

Key words: chromophore, poly（vinyl carbazole）, al- l optical switching effect, photoisotropy