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Proceedings Paper

Phase-matched second harmonic generation and nonlinear phase shift in a Langmuir-Blodgett film waveguide
Author(s): Sigurd K. Schrader; Costel Flueraru; Hubert Motschmann; Ludwig Brehmer
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Paper Abstract

Wave-guides have been prepared as y-type Langmuir-Blodgett multilayers from 2-docosylamino-5-nitropyridine (DCANP) on quartz glass substrates. The tensor elements of the LB-films as determined by polarization dependent second harmonic generation (SHG) are (Formula available in paper) The wave-guides were fabricated in a way that the second-order susceptibility changes sign at the nodal plane of the first-order wave-guide mode for s-polarization. In such wave-guides efficient second harmonic generation (SHG) was reached via mode conversion at a fundamental wavelength near 1064 nm. The conversion efficiency reached the extraordinary high value of 8%/W which corresponds to a normalized conversion efficiency of 3600 %/(W cm2). In addition, interferometric measurements have been carried out to study the non-linear phase-shift which the fundamental beam experiences due to non-linear interaction in the wave-guide. From these experiments an apparent intensity-dependent refractive index n2SHG of 2,6 10-13 cm2/W was calculated. This as about 400 times the intensity-dependent refractive as expected from third-order susceptibility of the isotropic material. From that it can be concluded that the main contribution of the intensity-dependent refractive index is connected to cascading of second-order processes.

Paper Details

Date Published: 7 December 2001
PDF: 12 pages
Proc. SPIE 4461, Linear and Nonlinear Optics of Organic Materials, (7 December 2001); doi: 10.1117/12.449835
Show Author Affiliations
Sigurd K. Schrader, Univ. of Potsdam (Germany)
Costel Flueraru, Institute for National Measurement Standards (Canada)
Hubert Motschmann, Max-Planck-Institut fuer Kolloid- und Grenzflaechenforschung (Germany)
Ludwig Brehmer, Univ. of Potsdam (Germany)

Published in SPIE Proceedings Vol. 4461:
Linear and Nonlinear Optics of Organic Materials
Manfred Eich; Mark G. Kuzyk, Editor(s)

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