Abstract
We experimentally demonstrate the generation of a flat broadband optical pulse in an Er/Yb co-doped double-clad fiber laser based on the nonlinear polarization rotation by inserting a 15 m highly-nonlinear fiber together with a 30 m single-mode fiber. Through changing the dispersive parameters of the cavity, phase matching is achieved and the efficiency of the four-wave mixing is enhanced. At 2000 mW pump power, the 3 dB bandwidth of the output noise-like pulse reaches ∼140 nm, and the optical spectrum is smooth and flat from 1528.2 to 1667.9 nm, which almost covers the C, L, and U bands. The separation of the neighboring pulses is ∼380.8 ns, and the corresponding repetition rate is ∼2.62 MHz. The output pulse energy is ∼30 nJ, which can be enhanced using an Er/Yb co-doped double-clad fiber laser and high-power pump.
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Wang, Y., Geng, K., Chen, T. et al. Flat and Broadband Pulse Generated in an Er/Yb Co-Doped Double-Clad Fiber Laser. J Russ Laser Res 43, 201–208 (2022). https://doi.org/10.1007/s10946-022-10039-0
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DOI: https://doi.org/10.1007/s10946-022-10039-0