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

    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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