Two-color phase-stable dual-comb ranging without precise environmental sensing

Zhu, Zebin; Ni, Kai; Zhou, Qian; Wu, Guanhao

doi:10.1364/oe.27.004660

Cited by 21 publications

(4 citation statements)

References 44 publications

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“…The dual comb relative stability we have demonstrated far exceeds the performance of previous unstabilized dual combs [25], and also outperforms dual combs stabilized using approaches such as reference lasers stabilized to external cavities [8], self referenced combs [13,37], or combs generated from the same laser cavity [38]. Furthermore, the performance exceeds that obtained by either digital [15,39] or analogue [17] post-processing. We ascribe this high frequency stability to the fact that all our generating frequencies are directly derived from phase stable microwave sources, which are all synchronized to the same 10 MHz clock.…”

mentioning

confidence: 68%

An ultra-stable microresonator-based electro-optic dual frequency comb

Lambert,

Trainor,

Schwefel

2021

Preprint

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Optical frequency combs emit narrow pulses of light with a stable repetition rate. Equivalently, the generated light spectrum consists of many discrete frequencies spaced by this same repetition rate. These precision light sources have become ubiquitous in applications of photonic technologies [1-6] because they allow coherent sampling over a broad part of the optical spectrum [7]. The addition of another comb, with a slightly different line spacing, results in a dual comb. Widely used in spectroscopy [8][9][10], dual combs allow one to read out the broad frequency response of a sample in a simple electronic measurement [11]. Many dual comb applications require a high level of mutual coherence between the combs [12], but achieving this stability can be demanding. Here, by exploiting the rich structure of the nonlinear electro-optic tensor in lithium niobate, we generate ultra-stable dual combs with the two combs naturally having orthogonal polarizations. Our combs have relative linewidths down to 400 microhertz, and require no stabilization or postprocessing methods. The ultra-high stability of the spectrum emitted by our device, along with its simplicity of operation and energy efficiency, offer a route to the deployment of robust and versatile dual comb sources.

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confidence: 68%

An ultra-stable microresonator-based electro-optic dual frequency comb

Lambert,

Trainor,

Schwefel

2021

Preprint

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“…Lately, recent progress in integrated photonics have enabled the demonstration of flat and broad combs with increased output power and will encourage the use of dual comb ranging as a mean to increase the resolution and acquisition speed of ranging systems. Furthermore, original methods such as repetition rate modulation [19] or two-color dual-comb ranging [30,32] provide remarkable improvements of the non-ambiguity range to precision ratio without the need of a complex comb generation technique. In the future, investigation of the effects of the free-space propagation such as atmospheric perturbation will be carried out.…”

Section: Discussionmentioning

confidence: 99%

Performance and limitations of dual-comb based ranging systems

Martin,

Feneyrou,

Dolfi

et al. 2022

Preprint

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Dual-comb LiDARs have the potential to perform high-resolution ranging at high speed. Here, through an implementation involving electro-optic modulators and heterodyne detection, we quantify the ranging systems trade-off between precision and non-ambiguity range (NAR) using a unique performance factor. We highlight the influence of the comb amplitude envelope on the precision with a distance measurement limited by the repetition rate of the optical comb. The influence of the combs repetition rate on the NAR and on the precision is illustrated through a setup allowing distance measurement with a tunable NAR. Finally, we demonstrate the impossibility to resolve different targets, quantify the impact on the measured distance and develop on the conditions in which non-linear effects of the interference make the measurement impossible.

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“…Please note that a dispersion device is required in the configuration of chirped pulse interferometry. Recently, dual-comb (and triple-comb) interferometry, using optical sampling [32][33][34][35] or multiple heterodyne interferometry [36][37][38], have developed rapidly. The unique combinations of time of flight and carrier phase measurements allow high precision and long range at the same time.…”

Section: Introductionmentioning

confidence: 99%

Precise underwater distance measurement using laser frequency comb

Xu¹,

Zhao²,

Zhang³

et al. 2021

Metrologia

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Underwater distance measurement has been playing an important role in the fields of underwater navigation, search and rescue, and bathymetric survey. However, limited by the measurement sources (e.g. acoustic pulses or incoherent optical pulses), the precision can only achieve centimeter level at best, which greatly obstructs the advancement of underwater science and technology. Recent developments of optical frequency combs have given rise to revolutionary progress in metrology, spectroscopy, and optical distance measurement in air. However, frequency comb-based underwater distance measurement has rarely been reported. In this work, we describe a spectral interferometry-based method using a laser frequency comb at 518 nm (green light), which is capable of underwater distance measurement with high precision and accuracy. Due to the inherently dispersive characteristic of water, the measurement pulse will be chirped, and the spectrograms exhibit unstable oscillations, the spectral phase of which features a quadratic law. Distances up to 4.4 m and displacements down to 5 μm underwater can be determined by virtue of the spectral phases. The experimental results show the differences within ±4 μm at 4.4 m range, compared to the reference values. The Allan deviation is 1.596 μm at 5 s averaging time, 481 nm at 100 s averaging time, and can achieve 261 nm with 540 s averaging time. Our work could provide a promising and powerful tool for underwater distance measurement with high precision at long range, and open the door to a host of underwater applications related to the measurement of distance, e.g. mapping and positioning.

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Two-color phase-stable dual-comb ranging without precise environmental sensing

Cited by 21 publications

References 44 publications

An ultra-stable microresonator-based electro-optic dual frequency comb

An ultra-stable microresonator-based electro-optic dual frequency comb

Performance and limitations of dual-comb based ranging systems

Precise underwater distance measurement using laser frequency comb

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