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Z-Scan measurements in poly (methyl methacrylate) doped with perylimide dyes

✍ Scribed by H. Manaa

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
438 KB
Volume
1
Category
Article
ISSN
1612-2011

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✦ Synopsis

Optical limiting with reverse absorption saturation is reported on plastic bulk of poly(methyl methacrylate) (PMMA) doped with two different perylimide molecules, KF 241 and BASF 339. The non-linear absorption coefficient Ξ² was measured at three wavelengths using the open z-scan technique. Ξ² was used to calculate the value of imaginary component of the third order non-linear susceptibility Ο‡ (3) . The nonlinear behavior is explained in terms of a six-level model of electronic structure.

Absorption spectra of (PMMA) doped with KF 241 and BASF 339 perylimide dyes.

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The spectra of transients produced in pulse-irradiated pure poly(methyl methacrylate), PMMA, at room and -130 K temperatures were measured. The intermediates were identified as PMMA radicals and radical anions. In the pulse-irradiated PMMA-pyrene (Py) system the solute excited states and radical ion