SHG In Langmuir/Blodgett Nonlinear Film Coated Fibers

R. H. Selfridge; T. K. Moon; P. Stroeve; J. Y. S. Lam; S. T. Kowel; A. Knoesen

doi:10.1117/12.948233

21 December 1988 SHG In Langmuir/Blodgett Nonlinear Film Coated Fibers

R. H. Selfridge, T. K. Moon, P. Stroeve, J. Y. S. Lam, S. T. Kowel, A. Knoesen

Proceedings Volume 0971, Nonlinear Optical Properties of Organic Materials; (1988) https://doi.org/10.1117/12.948233
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

A method to produce guided wave second harmonic generation (SHG) in coated multimode optical fibers is described and analyzed. The fiber cores are coated with a highly nonlinear hemicyanine dye by the Langmuir/Blodgett technique. This technique allows precise control over the film thickness to one monolayer (~3 nm). Deposition ratio data indicate that the deposition forms a noncentrosymmetric (Z-type) film. The SHG signal increases as a function of the film thickness for up to 80 monolayers (~240 nm) of dye. Analysis for calculating the propagation constants and energy distributions of the fundamental and harmonic modes is used to determine the requirements for phase matching in the composite fiber-film system. For most cases of interest the effective index of refraction for a given film mode in the coated region may be closely approximated by the propagation constant in a planar waveguide of equal thickness. The conditions for phase matching and selective excitation of modes for improved SHG efficiency are proposed. Efficient SHG in coated fibers could prove useful in frequency doubling of lasers. They would be more compatible with fiber optic communications systems than currently used single crystal and channel waveguide doublers. In addition, demonstration of SHG suggests that other second order nonlinear effects (i.e. linear electro-optic effect, parametric amplification) may be produced in a Langmuir/Blodgett (L/B) nonlinear film coated fiber system.

Citation Download Citation

R. H. Selfridge, T. K. Moon, P. Stroeve, J. Y. S. Lam, S. T. Kowel, and A. Knoesen "SHG In Langmuir/Blodgett Nonlinear Film Coated Fibers", Proc. SPIE 0971, Nonlinear Optical Properties of Organic Materials, (21 December 1988); https://doi.org/10.1117/12.948233

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