Studies of nonlinear optical properties of PicoGreen dye using Z-scan technique
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- Pradeep, C., Mathew, S., Nithyaja, B. et al. Appl. Phys. A (2014) 115: 291. doi:10.1007/s00339-013-7814-0
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In this paper we study the nonlinear optical properties of PicoGreen dye. The investigations involve the single-beam Z-scan technique and measurements were carried out at different incident intensities. Both open and closed aperture Z-scan techniques were performed at 532 nm and it was found that the dye exhibited a reverse saturable absorption with significant nonlinear absorption coefficient and intensity-dependent negative nonlinear refraction coefficient, indicating self-defocusing phenomena. The third-order nonlinear susceptibility and optical limiting threshold were also measured.