Computational Doppler-limited dual-comb spectroscopy with a free-running all-fiber laser

Sterczewski, Łukasz A.; Przewłoka, Aleksandra; Kaszub, Wawrzyniec; Sotor, Jarosław

doi:10.1063/1.5117847

Cited by 41 publications

(22 citation statements)

References 57 publications

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“…The viability of our current setup was demonstrated in a proof-of-principle experiment by resolving the transmission fringes of two etalons (700-µm thick GaAs and 5-mm thick ZnSe) without the need for active stabilization of the comb parameters. In combination with recent work on computational averaging techniques [39], we believe that free-running single-cavity dual-comb approaches such as the one presented here are a promising path towards robust and compact high-precision spectrometers.…”

Section: Discussionmentioning

confidence: 69%

Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser

Fellinger¹,

Mayer²,

Winkler³

et al. 2019

Opt. Express

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We demonstrate dual-comb generation from an all-polarization-maintaining dualcolor ytterbium (Yb) fiber laser. Two pulse trains with center wavelengths at 1030 nm and 1060 nm respectively are generated within the same laser cavity with a repetition rate around 77 MHz. Dual-color operation is induced using a tunable mechanical spectral filter, which cuts the gain spectrum into two spectral regions that can be independently mode-locked. Spectral overlap of the two pulse trains is achieved outside the laser cavity by amplifying the 1030-nm pulses and broadening them in a nonlinear fiber. Spatially overlapping the two arms on a simple photodiode then generates a down-converted radio frequency comb. The difference in repetition rates between the two pulse trains and hence the line spacing of the down-converted comb can easily be tuned in this setup. This feature allows for a flexible adjustment of the tradeoff between non-aliasing bandwidth vs. measurement time in spectroscopy applications. Furthermore, we show that by fine-tuning the center-wavelengths of the two pulse trains, we are able to shift the down-converted frequency comb along the radio-frequency axis. The usability of this dual-comb setup is demonstrated by measuring the transmission of two different etalons while the laser is completely free-running.

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Section: Discussionmentioning

confidence: 69%

Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser

Fellinger¹,

Mayer²,

Winkler³

et al. 2019

Opt. Express

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“…Finally, similar to other computational post-processing methods without accurate optical reference [ 31 , 34 , 36 ], our method is not capable of measuring the absolute frequency of OFC modes. To realize accurate frequency up-conversion from RF domain to optical frequency domain, prior absorption line position of H 13 C 14 N molecular

is marked as a frequency reference.…”

Section: Methodsmentioning

confidence: 96%

“…These schemes can be divided into two branches. The first branch pursued to improve the natural coupling between two passive mode-locked lasers, several dual-comb shared single cavity light sources have been designed to suppress the common-mode noise [ 30 , 31 , 32 ]. This method is effective and low-cost, yet the tuning flexibility, stability, and robustness are still deficient compared to separate dual-comb configuration, which limits the hand-off running time and potential industrial perspective.…”

Section: Introductionmentioning

confidence: 99%

Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method

Zhou

et al. 2021

Sensors

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Dual-comb spectroscopy has been an infusive spectroscopic tool for gas detection due to its high resolution, high sensitivity, and fast acquisition speed over a broad spectral range without any mechanical scanning components. However, the complexity and cost of high-performance dual-comb spectroscopy are still high for field-deployed applications. To solve this problem, we propose a simple frequency domain post-processing method by extracting the accurate position of a specific absorption line frame by frame. After aligning real-time spectra and averaging for one second, the absorbance spectrum of H13C14N gas in the near-infrared is obtained over 1.1 THz spectral range. By using this method, the standard deviation of residual error is only ~0.002, showing great agreement with the conventional correction method. In addition, the spectral resolution is improved from 13.4 GHz to 4.3 GHz compared to direct spectrum averaging. Our method does not require a specially designed common-mode suppression comb, rigorous frequency control system, or complicated computational algorithm, providing a cost-effective scheme for field-deployed Doppler-limited spectroscopy applications.

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“…This analysis follows techniques described in detail in our previous report. [ 16 ] The results of the relative coherence analysis are plotted in Figure 5b–f. First, despite the 4 MHz‐wide fluctuations of the CW laser beat notes, the difference frequency (Figure 5b) remains almost constant with a 30 kHz drift in total.…”

Section: Characterization Of the Free‐running Dual‐comb Lasermentioning

confidence: 99%

Dual‐Comb Femtosecond Solid‐State Laser with Inherent Polarization‐Multiplexing

Kowalczyk

Sterczewski

Zhang

et al. 2021

Laser & Photonics Reviews

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Dual‐comb spectroscopy is a rapidly developing technique enabling ultraprecise broadband optical diagnostics of atoms and molecules. This powerful tool typically requires two phase‐locked femtosecond lasers, yet it has been shown that it can be realized without any stabilization if the combs are generated from a single laser cavity. Still, unavoidable intrinsic relative phase fluctuations always set a limit on the precision of any spectroscopic measurements, hitherto limiting the applicability of bulk dual‐comb lasers for mode‐resolved studies. Here, a versatile concept for low‐noise dual‐comb generation from a single‐cavity femtosecond solid‐state laser based on intrinsic polarization‐multiplexing inside an optically anisotropic gain crystal is demonstrated. Due to intracavity spatial separation of the orthogonally polarized beams, two sub‐100 fs pulse trains are simultaneously generated from a 1.05 µm Yb:CNGS (calcium niobium gallium silicate) oscillator with a repetition rate difference of 4.7 kHz. The laser exhibits the lowest relative noise ever demonstrated for a bulk dual‐comb source, supporting free‐running mode‐resolved spectroscopic measurements over a second. Moreover, the developed dual‐comb generation technique can be applied to any solid‐state laser exploiting a birefringent active crystal, paving the way toward a new class of highly coherent, single‐cavity, dual‐comb laser sources operating in various spectral regions.

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Computational Doppler-limited dual-comb spectroscopy with a free-running all-fiber laser

Cited by 41 publications

References 57 publications

Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser

Tunable dual-comb from an all-polarization-maintaining single-cavity dual-color Yb:fiber laser

Improving Resolution of Dual-Comb Gas Detection Using Periodic Spectrum Alignment Method

Dual‐Comb Femtosecond Solid‐State Laser with Inherent Polarization‐Multiplexing

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