Attenuation and speckle modulation of laser light in dispersive dye-doped media: Competition of absorption and scattering processes |
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| Authors: | D.A. Zimnyakov E.A. Isaeva A.A. Isaeva M.V. Pavlova A.P. Sviridov V.N. Bagratashvili |
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| Affiliation: | 1. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala, India;2. International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, India;3. School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, India;4. FRE CNRS 3744, IRDL, University of Southern Brittany, Lorient, France;5. Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia |
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| Abstract: | The effect of competition of laser light absorption and scattering in dispersive media (1 μm polystyrene microspheres in ethylene glycol) with added dye (rhodamine 6G) was studied under the condition of near-resonant absorption of probe light in the host medium (solution of rhodamine 6G in ethylene glycol). The parameters of speckle modulation of transmitted light (the average speckle intensity and the oscillation index) were applied for characterization of light transport in the probed scattering systems as a function of dye concentration. The increase in dye concentration does not cause the expected decay in the transmittance of the examined dispersive systems for 532 nm laser light, but results in the decrease of their turbidity. This effect is accompanied by the rise of the average intensity and the oscillation index of speckle-modulated light, and can be rationalized by partial matching of the real parts of refractive indices for the host medium and embedded scatterers. This interpretation was supported by statistical modeling of light transport through the examined scattering systems. |
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