Cascading Of 2Nd-Order Processes In Quadratic Molecular Media At The Origin Of Very Large Cubic Effects

    Authors

    P. Vidakovic; J. Zyss; D. Kim; W. Toruellas; G. Stegeman; W. E. Moerner; R. Twieg;G. Bjorklund

    Comments

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    Abbreviated Journal Title

    Synth. Met.

    Keywords

    2ND-ORDER PROCESSES; QUADRATIC MOLECULAR MEDIA; NONLINEAR PHASE-SHIFTS; 2ND-HARMONIC GENERATION; ORGANIC MATERIAL; SINGLE-CRYSTALS; 4-(N, N-DIMETHYLAMINO)-3-ACETAMIDONITROBENZENE; OPTICS; GROWTH; KTP; Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer; Science

    Abstract

    We have shown that very large nonlinear shifts ranging from pi/4 to pi/2 observed at relatively modest input intensities in single-crystal cored fibers of 4-(N,N-dimethylamino)-3-acetamidonitrobenzene (DAN) have their origin in the cascading of two second-order nonlinear processes: second-harmonic generation followed by down-frequency conversion. The nonlinear shifts and corresponding n(2) values extracted from independent observations of self-phase modulation and direct interferometric measurements are as large as 10(-12) cm(2)/W at relatively modest input intensities from 30 to 60 MW/cm(2). The cascading origin of large n(2) values was fully confirmed by z-scan measurements performed on a single DAN crystal.

    Journal Title

    Synthetic Metals

    Volume

    67

    Issue/Number

    1-3

    Publication Date

    1-1-1994

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    303

    Last Page

    307

    WOS Identifier

    WOS:A1994PW12000059

    ISSN

    0379-6779

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