Ultrafast nonlinear optical properties of dye-doped PMMA discs irradiated by 40 fs laser pulses

作者：Xia Yuanqin^*; Jiang Yugang; Fan Rongwei; Dong Zhiwei; Zhao Weijiang; Chen Deying; Umesh G

来源：Optics and Laser Technology, 2009, 41(6): 700-704.

DOI：10.1016/j.optlastec.2009.01.011

• fs laser pulse
• Solid-state dye material
• Two-photon absorption

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) cm(4) 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.

• 出版日期2009-9
• 单位哈尔滨工业大学