0.017 nm, 143 ps passively mode-locked fiber laser based on nonlinear polarization rotation

Mode-locked lasers with ultra-narrow spectral widths and durations of hundreds of picoseconds can be versatile light sources for a variety of newly emergent applications. However, less attention seems to be given to mode-locked lasers that generate narrow spectral bandwidths. We demonstrate a passively mode-locked erbium-doped fiber laser (EDFL) system that relies on a standard fiber Bragg grating (FBG) and the nonlinear polarization rotation (NPR) effect. This laser achieves the longest reported pulse width (to the best of our knowledge) of 143 ps based on NPR and an ultranarrow spectral bandwidth of 0.017 nm (2.13 GHz) under Fourier transform-limited conditions. The average output power is 2.8 mW, and the single-pulse energy is 0.19 nJ at a pump power of 360 mW. (c) 2023 Optica Publishing Group

Automated summary

This study reveals a passively mode-locked erbium-doped fiber laser (EDFL) system utilizing a standard fiber Bragg grating (FBG) and the nonlinear polarization rotation (NPR) effect. The laser achieves a pulse width of 143 ps and an ultranarrow spectral bandwidth of 0.017 nm (2.13 GHz) under Fourier transform-limited conditions. The average output power is 2.8 mW, and the single-pulse energy is 0.19 nJ.