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Study of nonlinear optical properties of organic dye by Z-scan technique using He–Ne laser

Research paper by R. K. Choubey, S. Medhekar, R. Kumar, S. Mukherjee, Sunil Kumar

Indexed on: 25 Jan '14Published on: 25 Jan '14Published in: Journal of Materials Science: Materials in Electronics



Abstract

Laser induced nonlinear absorption coefficient of Brilliant Green solution was measured by single beam open aperture Z-scan technique using a continuous wave He–Ne laser at the wavelength of 632.8 nm. It was found that the material exhibits multiphoton absorption type optical nonlinearity. Significant optical nonlinearity is an indicative that Brilliant Green dye is prominent material for low power nonlinear applications. Ultraviolet–visible and photoluminescence (PL) spectra of Brilliant Green solutions are also recorded. A strong linear absorption band with a peak at 625 nm has been observed, while the PL intensity was found to decrease due to quenching effect on increasing the concentration.