2.04 µm harmonic noise-like pulses generation from a mode-locked fiber laser based on nonlinear polarization rotation
Xiao-fa Wang , Zeng-gao Jin , Jing-hui Liu
Optoelectronics Letters ›› 2021, Vol. 17 ›› Issue (1) : 18 -21.
2.04 µm harmonic noise-like pulses generation from a mode-locked fiber laser based on nonlinear polarization rotation
We report the generation of harmonic noise-like mode-locked pulses in a thulium-doped fiber laser. In this laser, mode-locking can be realized through the nonlinear polarization rotation (NPR) technique. The ring cavity configuration uses 5 m of a Tm-doped dual-cladding fiber, as a gain medium, pumped by a 793 nm diode laser. The cavity uses a couple of polarization controllers (PCs) and polarization-dependent isolator to form a nonlinear polarization-rotating saturable absorber. By carefully adjusting of the PCs, the laser generates noise-like mode-locked pulses at the 2.04 µm band. With the increase of the pump power, the laser generates harmonics of the mode-locking fundamental repetition frequency of 6.88 MHz, from which we can obtain the second harmonic in a controlled mode. The obtained results may be useful for enhancing the understanding of the mechanism and characteristics of noise-like pulse at the 2 µm band.
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