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In this paper, we report that diffractionless propagation is also possible in the visible spectral range by downscaling the slab system as well as the PC parameters. The experimentally obtained wavelengths for optimal guidance are in excellent agreement with iso-frequency calculation
We report on a high energy CPA system based on amplification in low-nonlinearity photonic crystal fibers. The resulting output of pulse energies of 100 muJ in ultrashort pulses with high repetition rates are applied to high speed micromachining. e.g. the drilling of holes in 1 mm thick steel
The mini-stop bands of wide photonic crystal waveguides in a slab system with a low in-plane index contrast are investigated both experimentally and theoretically. Their performance as high suppression filters is discussed.
We report on a 2.3 m long air-clad ytterbium-doped large-mode-area photonic crystal fiber laser generating up to 80 W output power with a slope efficiency of 78%. Single transverse mode operation is achieved with a mode-field area of 350 /spl mu/m/sup 2/. No thermo-optical limitations are observed at the extracted /spl sim/35 W/m, therefore such fibers allow scaling to even higher powers.
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