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We propose an As2Se3-based photonic quasi-crystal fiber (PQF) with high nonlinearity and birefringence. By optimizing the structure parameters, a nonlinear coefficient up to 2079 W−1km−1 can be achieved at the wavelength of 2 μm; the birefringence reaches up to the order of 10−2 due to the introduction of large circular air holes in the cladding. Using an optical pulse with a peak power of 6 kW, a...
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