Intensity dependent nonlinear absorption of pyrylium chromophores

被引：61

作者：

Fakis, M

Tsigaridas, G

Polyzos, I

Giannetas, V

Persephonis, P ^{[1
]}

Spiliopoulos, I

Mikroyannidis, J

机构：

[1] Univ Patras, Dept Phys, GR-26500 Patras, Greece

[2] Univ Patras, Dept Chem, GR-26500 Patras, Greece

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 342卷 / 1-2期

关键词：

D O I：

10.1016/S0009-2614(01)00551-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The intensity dependence of nonlinear absorption (NLA) of a series of pyrylium chromophores was studied with femtosecond pulses in their two-photon absorption spectral region to assess their potential as optical limiters. The open z-scan technique using different excitation intensities was employed. Fifth-order effects appear above a critical value of the irradiance and consequently of the first excited singlet-state population. Reverse saturable absorption (RSA) based on two-photon(TPA) and excited-state absorption (ESA) was dominant in most cases. The third- and fifth-order NLA coefficients and high ESA cross-sections of the order of 10(-15) cm(2) are presented at 760, 790 and 840 nm. (C) 2001 Elsevier Science B.V. All rights reserved.

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页码：155 / 161

页数：7

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