Pramodini, S and Poornesh, P (2014) Third-order nonlinear optical studies of anthraquinone dyes using a CW He–Ne laser. Laser Physics, 24. ISSN 1555-6611

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Abstract

We present investigations on the thirdorder optical nonlinearity and optical power limiting of anthraquinone dyes. Zscan measurements were performed using a continuous wave He–Ne laser at 633 nm wavelength as an excitation source. The nonlinear refraction studies exhibited selfdefocusing behavior of the dyes. The nonlinear absorption in the dyes was dominated by a reverse saturable absorption process. Selfdiffraction ring patterns were observed due to the change in refractive index and thermal lensing. Increase of the electron donating ability of the substituents resulted in enhanced values of the nonlinear optical parameters, establishing the structure–property relationship. The optical limiting study revealed that the dyes possess a lower limiting threshold and clamping level which is very important for eye and sensor protection. Hence, the dyes investigated here emerge as promising candidates for future optoelectronic and photonic device applications such as optical power limiters.

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