• P-ISSN 0974-6846 E-ISSN 0974-5645

Indian Journal of Science and Technology


Indian Journal of Science and Technology

Year: 2009, Volume: 2, Issue: 8, Pages: 27-31

Original Article

Non-linear characterization and optical limiting effect of carmine dye


Thermally induced optical nonlinearity of carmine dye in methanol is studied using a CW Nd-YAG laser at 532 nm as the source of excitation, both in solution and solid film (Methylmethacrylate- MMA), respectively. The optical response is characterized by measuring the intensity dependent refractive index (n2) of the medium using the Z-scan technique. The dye exhibited a negative (defocusing) nonlinearity and large nonlinear refractive index of the order of 10−7 cm2 /W. The nonlinear refractive index was found to vary with concentration. The third-order nonlinearity of the dye was dominated by nonlinear refraction, which leads to strong optical limiting of laser. The result reveals that carmine dye can be a promising material for optical limiting applications.

Keywords: Z-scan, carmine dye, NLO properties, optical limiting


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