首页|Multi-octave supercontinuum generation in As2Se3 chalcogenide photonic crystal fiber
Multi-octave supercontinuum generation in As2Se3 chalcogenide photonic crystal fiber
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NSTL
Elsevier
We numerically calculated multi-octave spanning supercontinuum generation (SCG) in two proposed As2Se3 photonic crystal fibers (PCFs) with low input peak powers and highly coherent characteristics with the effects of vacuum noise and pulse-to-pulse relative intensity noise. The first PCF with a lattice constant (?) of 1.5 mu m and core diameter (dcore) of 5.48 mu m has the flat all-normal dispersion in the wavelength range of 2-10 mu m. For the input peak power of 5 kW, this fiber generates the all-normal dispersion SCG with a spectral bandwidth of 1.85-5.7 mu m with pump wavelength at 3.5 mu m, and two octave-spanning of 1.9-7.6 mu m with pump wavelength at 5.5 mu m. The second PCF with ? of 1.52 mu m and dcore of 7.3 mu m has flat dispersion and two zero-dispersion wavelengths at 4.3 mu m and 7.8 mu m. By launching the input peak power of 7.5 kW, and pump wavelength at 3.5 mu m, the second PCF generates the broad SCG with a spectral bandwidth of 2-10 mu m. The SCG in two proposed PCFs has high coherence due to the effects of vacuum noise. However, the results of our works point out that pulse-to-pulse relative intensity noise significantly decreases the coherence. The amount of coherence reduction depends on the pulse duration and the physical mechanism for spectral broadening in which a part of the supercontinuum spectrum induced by optical wave breaking and dispersive wave experiences a remarkable reduction of coherence due to the effects of pulse-to-pulse relative intensity noise.
NSTL
Elsevier
