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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Supplementary Material (1)

NameDescription
Visualization 1       Temporal comparison between PM and non-PM cavities under external mechanical perturbations

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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