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We report the design of an ultrashort pulse amplifier based on using a chalcogenide gain fiber with a praseodymium doped core for operating in the 4–5 μm range on the (3F2, 3H6 ) → 3H5 and 3H5→3H4 transitions. A detailed numerical simulation with allowance for dispersive and nonlinear effects for two pumping schemes: four-level at 1.55 μm and three-level at 2 μm with different fiber optical losses,...
A new variant of the fiber laser for generation of ultrashort pulse bunches and sequences with repetition rate in the range of 8–260 GHz, which combines a nonlinear amplifying loop mirror and a comb spectral filter for stabilization of the pulse separation, was demonstrated. We showed that a well-ordered and equidistant structure of the pulse sequence is maintained on a nanosecond timescale.
We have demonstrated numerically the possibility to obtain ultrashort laser pulses in the range beyond 4 microns due to soliton self-frequency shift and red-shifted dispersive wave generation in a suspended-core fiber made of specially synthesized high-purity low-loss Te2O3-WO3-La2O3 glass pumped by a standard fs pump laser source at 2 microns.
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