Ultrafast nonlinear optical properties of dye-doped PMMA discs irradiated by 40 fs laser pulses |
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| Authors: | Yuanqin Xia Yugang Jiang Rongwei Fan Zhiwei Dong Weijiang Zhao Deying Chen G Umesh |
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| Institution: | 1. National Key Lab of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China;2. Department of Physics, National Institute of Technology Karnataka, Surathkal, Mangalore 575025, India;1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China;2. Department of Physics, Harbin Institute of Technology, 150001 Harbin, China;1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China;2. Shenzhen Aerospace Industry Technology Research Institute, Shenzhen 518000, China;3. Jiangsu Key Laboratory of Medical Optics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China;4. The Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;5. Suzhou Guoke Medical Science & Technology Development Co. Ltd, Suzhou 215163, China;1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China;2. Institute of Optoelectronics Technology, Harbin Institute of Technology, Harbin 150080, China;1. National key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China;2. Heilongjiang Institute of Technology, Harbin 150050, China;1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150080, China;2. Department of Physics, Harbin Institute of Technology, 150001 Harbin, China |
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| Abstract: | The two-photon absorption (TPA) characteristics of PMMA discs doped with three different dyes were studied using an fs-pulsed Ti-Sapphire laser as the pump source, and employing the open-aperture Z-scan technique. TPA cross-sections obtained for PMMA doped with the dyes PM597, DCM and rhodamine 6G–rhodamine B (co-doped) were found to be equal to 24.7, 33.3 and 32.3 GM, respectively (1 GM=10?50 cm4 s phot?1 mol?1). Furthermore, two-photon fluorescence was measured for the samples containing DCM and rhodamine 6G–rhodamine B (co-doped). Compared to the one-photon fluorescence spectrum, the peaks in the two-photon fluorescence spectrum were red shifted and the extent of red shift increased with increasing doping concentration. We have also observed that the red shift in the two-photon fluorescence peak of the samples in the solid form is much larger than that in the solution state. This phenomenon could be explained by a twisted intra-molecular charge transfer model. |
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