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Non-linear Characterization and Optical Limiting Effect of Carmine Dye


Affiliations
1 Centre for Laser Technology, Department of Physics, Anna University, Chennai-600025, India
 

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

Keywords: Z-scan, Carmine Dye, NLO Properties, Optical Limiting
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  • Non-linear Characterization and Optical Limiting Effect of Carmine Dye

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Authors

R. K. Rekha
Centre for Laser Technology, Department of Physics, Anna University, Chennai-600025, India
A. Ramalingam
Centre for Laser Technology, Department of Physics, Anna University, Chennai-600025, India

Abstract


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


Keywords: Z-scan, Carmine Dye, NLO Properties, Optical Limiting

References





DOI: https://doi.org/10.17485/ijst%2F2009%2Fv2i8%2F29505