Please use this identifier to cite or link to this item: https://idr.l1.nitk.ac.in/jspui/handle/123456789/13668
Title: Ultrafast nonlinear optical properties of dye-doped PMMA discs irradiated by 40 fs laser pulses
Authors: Xia, Y.
Jiang, Y.
Fan, R.
Dong, Z.
Zhao, W.
Chen, D.
Umesh, G.
Issue Date: 2009
Citation: Optics and Laser Technology, 2009, Vol.41, 6, pp.700-704
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. � 2009 Elsevier Ltd. All rights reserved.
URI: 10.1016/j.optlastec.2009.01.011
http://idr.nitk.ac.in/jspui/handle/123456789/13668
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