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In this paper the linear and nonlinear optical properties(n 2 , β), also switching behavior of Acid Red 27 by Z-scan technique is used to study the nonlinear absorption and nonlinear refraction behavior of the organic dye Acid Red of laser at 532 nm with 5.26 mW, Where the value of the nonlinear absorption coefficient of the highest concentration 10 -4  is 1.558*10 -3 (cm/W) and the value of the nonlinear refractive index was of the highest concentration 10 -4  is 8.362*10 -7  (cm 2 /W )and. The results show the behavior of Acid Red 27 is saturable also the dye have negative refractive index (self -defocusing)for all concentration studied according to the nonlinear results the behavior of optical switch have been studied by using laser at 532 nm as a pump and 632.8 nm as a prop, where it is observed that the amplitude of prop laser decreases with increasing modulation frequency. The effect of intensity and concentration on the number of diffraction rings was also studied, the results show the number of ring increased with increasing intensity of laser and concentration of dye.

Nonlinear characterization and optical switching of Acid red 27 dye