Nonlinear Characterization of Safranin O Dye for Application in Optical Limiting

• Authors: G. Balaji , R. Rekha , A. Ramalingam
• Languages of publication: EN

Abstracts

EN

The optical nonlinearity of safranin O dye in methanol solution at different concentrations and as a solid film with polymethylmethacrylate (PMMA) has been studied using cw Nd-YAG laser at 532 nm as the source of excitation. The optical responses were characterized by measuring the intensity dependent refractive index (n_2) of the medium using the Z-scan technique. The open aperture Z-scan trace of the dye in solution and solid sample displayed saturable absorption. The closed aperture Z-scan trace of the dye exhibited a negative (defocusing) nonlinearity. The nonlinear refractive index was found to vary with concentration. Optical limiting characteristics of the dye at various concentrations in solution were studied. The nonlinearity appears to be of thermal origin.

Keywords

EN

42.70.Jk; 42.65.-k; 82.35.-x

Discipline

• 82.35.-x: Polymers: properties; reactions; polymerization(for polymers in electrochemistry, see 82.45.Wx)
• 42.70.Jk: Polymers and organics
• 42.65.-k: Nonlinear optics

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 119
• Issue: 3
• Pages: 359-363

Dates

published

2011-03

received

2010-02-21

(unknown)

2010-05-05

Contributors

author

G. Balaji

• Centre for Laser Technology, Department of Physics, Anna University, Chennai 600025, India

author

R. Rekha

• Centre for Laser Technology, Department of Physics, Anna University, Chennai 600025, India

author

A. Ramalingam

• Centre for Laser Technology, Department of Physics, Anna University, Chennai 600025, India

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Identifiers

DOI

10.12693/APhysPolA.119.359