Abstract

In this Letter, a high-stability, linearly polarized mode-locked polarization-maintaining (PM) ${\rm{E}}{{\rm{r}}^{3 +}}$-doped fluoride fiber oscillator at ${\sim}{2.8}\;{\rm{\unicode{x00B5}{\rm m}}}$ is presented for the first time, to the best of our knowledge, where an InAs-based semiconductor saturable absorber mirror is used as the mode locker, and a film polarizer is employed for maintaining the linearly polarized oscillation. In the free-running state, stable linearly polarized mode-locked pulses ($\tau = {{44}}\;{\rm{ps}}$ and ${\rm{P}} = {{446}}\;{\rm{mW}}$) at 2.795 µm, with a high polarization extinction ratio of ${\gt}{{23}}\;{\rm{dB}}$ and a low integrated relative intensity noise of 0.087% [1 Hz–10 MHz], have been achieved, which can be strongly immune to external mechanical perturbations. By introducing a ruled reflective diffraction grating into the cavity in a Littman configuration, the continuous wavelength tuning of the linearly polarized mode-locked pulses in the range of 2717–2827 nm is obtained as well. To the best of our knowledge, this marks the first demonstration of a linearly polarized PM fiber oscillator in the ${\gt}{2.5}\;\unicode{x00B5}{\rm m}$ mid-infrared region.

© 2021 Optical Society of America

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