Direct experimental observation of periodic intensity modulation along straight hollow core optical waveguides

Details Direct experimental observation of periodic intensity modulation along straight hollow core optical waveguides Direct experimental observation of periodic intensity modulation along straight hollow core optical waveguides

2006-09-09

arxiv.org/abs/physics/0609080v1

Physics

Optics

12 pages, 4 figures, based on results obtained during M.A. work of TP (first author) at the University of Texas at Austin and

Scientific paper

10.1364/JOSAB.24.001025

We report the direct observation of periodic intensity modulation of a laser pulse propagating in a hollow core waveguide. A series of equally spaced plasma sparks along the gas-filled capillary is produced. This effect can be explained by the beating of different fiber modes, which are excited by controlling the size of the focal spot at the capillary entrance. As compared to an artificial modulated waveguide structure, our presented approach represents an easier and more flexible quasi-phase-matching scheme for nonlinear-optical frequency conversion.

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