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Tuned by a variable reflective mirror, we achieve 71.2-W free-running and 30-W maximum average power in range of 1866-2107 nm in Tm-doped fiber lasers. Watt-level powers are generated from single crystal and ceramic Cr2+:ZnSe disk lasers.
We fabricated photonic crystal nanocavities to enhance erbium (Er) emission in silicon rich nitride nanocrystals. We observed experimental quality factors of ~6000 and 20-fold enhancement, in agreement with numerical calculations of the Purcell effect.
Optimization studies of InGaN quantum wells light emitting diodes employing SiO2/polystyrene microlens arrays are conducted. The use of microlens arrays leads to increase in light extraction efficiency by 2.7-times, in agreement with simulation.
Numerical simulations and experiments are performed to investigate the use of thin conformal silicon nitride cladding layers to engineer the dispersion properties of silicon nanophotonic waveguides.
Coherent thermal emission from an anisotropic microstructure upon SiC is presented. The enhanced coherency is due to coupled resonant cavities supported by surface phonon-polaritons. A quality-factor 600 and an angular divergence of 1.4 mrad are obtained.
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