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Mechanical sharing dual-comb fiber laser based on an all-polarization-maintaining cavity configuration

Yoshiaki Nakajima, Yugo Kusumi, and Kaoru Minoshima

Open Access Open Access

Abstract

We present a mechanical sharing, dual-comb fiber laser based on an all-polarization-maintaining cavity configuration and a nonlinear amplifying loop mirror mode-locking mechanism. This simple setup yields dual-optical frequency combs with a high level of mutual coherence without active servo control. We realized a high relative stability with a standard deviation of 0.27 Hz and a relative beat note between the dual-frequency combs with a full-width at half-maximum of ${\sim}{{50}}\;{\rm{Hz}}$. Dual-frequency combs were found to have high relative stability and mutual coherence owing to passive common-mode noise suppression using a mechanical sharing laser cavity. This laser configuration can significantly simplify dual-comb spectroscopy.

© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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Data Availability

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

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Figures (4)
Fig. 1.
Fig. 1. Schematic of an all-PM dual-comb fiber laser with mechanical sharing cavity and an NALM. EDF, Er-doped fiber; LD, laser diode; PBC, polarization beam combiner; HWP and QWP, half- and quarter-wave plate, respectively; FR, Faraday rotator; PBS, polarization beam splitter.

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Fig. 2.
Fig. 2. (a) Optical spectra and (b) RF spectra of two laser outputs. (c) Temporal variation in the repetition rates of the two frequency combs and the difference in the repetition rate ( $\Delta {f_{\rm{rep}}}$ ). (d) Allan deviation of $\Delta {f_{\rm{rep}}}$ with (red) and without (black) mechanical sharing.

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Fig. 3.
Fig. 3. (a) RF spectrum and (b) spectral density (upper) and integrated (lower) phase noise of the relative beat note between a pair of comb teeth from dual-frequency combs at 1565 nm. The beat note has a linewidth of  ${\sim}{{50}}\;{\rm{Hz}}$ for a measurement duration of 38 ms. (c) Multi-heterodyne beat notes between the two frequency combs with $\Delta {f_{\rm{rep}}}$ of 150 Hz. (d) Magnified and normalized multi-heterodyne beat notes of red square bracket in (c).

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Fig. 4.
Fig. 4. Dual-comb spectroscopy of an HCN cell with a mechanical sharing dual-comb fiber laser ( $\Delta {f_{\rm{rep}}} = {{150}}\;{\rm{Hz}}$ ). (a) Temporal interferogram, (b) magnified signal of (a), and (c) dual-comb spectra obtained by implementing Fourier transform on the interferogram (a) with an acquisition duration of $20\,\,\unicode{x00B5}{\rm s}$ around the burst point. (d) Transmitted spectrum of the same cell obtained by using an optical spectrum analyzer.

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