1 December 1991 Frequency-tunable THG measurements of x(3) between 1-2.1μm of organic conjugated-polymer films using an optical parametric oscillator
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Abstract
Resonant enhancement can greatly influence a materials third order optical nonlinearity and therefore (chi) (3) values can be highly wavelength dependent. The increased flexibility of a frequency tunable optical parametric oscillator (OPO) with a tuning range of 420 - 2500 nm has allowed us to measure, with relative ease, (chi) (3) dispersion curves in a THG experiment thereby identifying and quantifying resonant enhancement. The OPO is based on a (beta) -BBO crystal and is pumped by the third harmonic of a Q-switched Nd:YAG laser yielding a total output efficiency of greater than 15%. Conjugated polymers have been shown to display an order of magnitude enhancement of the cubic susceptibility due to 2 or 3 photon resonances. In this paper we display (chi) (3) values between 1 - 2.1 micrometers for polyacetylene, all trans-(beta) -carotene and Manganese phthalocyanine, which all show evidence of resonance effects in this wavelength region. The dispersion of (chi) (3) can be measured by tuning the OPO by crystal rotation to the appropriate resonant or nonresonant wavelength.
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Alfred Gierulski, Alfred Gierulski, Herbert Naarmann, Herbert Naarmann, Wolfgang Schrof, Wolfgang Schrof, Anton Ticktin, Anton Ticktin, } "Frequency-tunable THG measurements of x(3) between 1-2.1μm of organic conjugated-polymer films using an optical parametric oscillator", Proc. SPIE 1560, Nonlinear Optical Properties of Organic Materials IV, (1 December 1991); doi: 10.1117/12.50746; https://doi.org/10.1117/12.50746
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