Title

Picosecond optical limiting in reverse saturable absorbers: a theoretical and experimental study

Authors

Authors

R. Lepkowicz; A. Kobyakov; D. J. Hagan;E. W. Van Stryland

Comments

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Abbreviated Journal Title

J. Opt. Soc. Am. B-Opt. Phys.

Keywords

EXCITED-STATE ABSORPTION; NONLINEAR ABSORPTION; ORGANIC-DYES; Z-SCAN; POLYMETHINE; LIMITERS; PULSE; Optics

Abstract

We theoretically and experimentally study absorption of picosecond laser pulses in materials described by a four-level system that exhibit reverse saturable absorption (RSA). Using an approximate solution to the rate equations, we derive, analyze, and verify, numerically and experimentally, a single dynamical equation for the spatial evolution of the pulse fluence that includes both the rate equations and the propagation equation. This analytical approach considerably simplifies the study of optical limiting with picosecond pulses and helps to predict the behavior of the nonlinear transmittance, the level of output signal clamping, and a possible turnover from RSA to saturable absorption that restricts the performance of optical limiters based on RSA. The results obtained can also be used to characterize RSA materials by the pump-probe technique. (C) 2002 Optical Society of America.

Journal Title

Journal of the Optical Society of America B-Optical Physics

Volume

19

Issue/Number

1

Publication Date

1-1-2002

Document Type

Article

Language

English

First Page

94

Last Page

101

WOS Identifier

WOS:000173257100013

ISSN

0740-3224

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