Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement

Wu, Guanhao; Liao, Lei; Xiong, Shoumei; Li, Guoyuan; Cai, Zhijian; Zhu, Zebin

doi:10.1038/s41598-018-22838-0

Cited by 20 publications

(11 citation statements)

References 37 publications

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“…An optical frequency comb (OFC), which provides numerous ultra-narrow linewidth wavelengths over a broad optical spectral range, is the Fourier transform of femtosecond ultrashort pulses from a mode-locked laser in the time domain. It enables versatile advanced absolute distance measurement methods, including synthetic wavelength interferometry (SWI) [12,[23][24][25], multiwavelength interferometry (MWI) [26][27][28][29][30], dispersive interferometry (also known as spectrally resolved interferometry, SRI) [31][32][33][34], dual-comb interferometry [35][36][37][38][39], and time-of-flight (TOF) measurement [40][41][42][43][44]. Compared with other methods, the dispersive interferometry can achieve a high resolution of distance measurement.…”

Section: Introductionmentioning

confidence: 99%

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Liu¹,

Wu²,

Suzuki³

et al. 2023

Preprint

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Two algorithms of data processing are proposed to shorten the unmeasurable dead-zone close to the zero-position of measurement, i.e., the minimum working distance of a dispersive interferometer using optical frequency comb, which is a critical issue in millimeter-order short-range absolute distance measurement. After demonstrating the limitation of the conventional data processing algorithm, the principles of the proposed algorithms, namely the spectral fringe algorithm, and the combined algorithm that combines the spectral fringe algorithm with the excess fraction method, are presented, together with simulation results for demonstrating the possibility of the proposed algorithms for shortening the dead-zone with a high accuracy. An experimental setup of dispersive interferometer is also constructed for implementing the proposed data processing algorithms over spectral interference signals. Experimental results demonstrate that the dead-zone by the proposed algorithms can be as small as half of that by the conventional algorithm while the measurement accuracy can be further improved with the combined algorithm.

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Section: Introductionmentioning

confidence: 99%

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Liu¹,

Wu²,

Suzuki³

et al. 2023

Preprint

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show abstract

“…To reach higher precision, combined approach based on TOF method and coherent detection is adopted. Cross-correlation-based TOF method [6], [7], synthetic wavelength interferometry [8]- [10], spatial dispersive interferometry [11], [12], and dual comb interferometry [13]- [15] can realize nanometer precision with averaging time of several milliseconds to seconds.…”

Section: Introductionmentioning

confidence: 99%

Nanometer Precision Time-Stretch Femtosecond Laser Metrology Using Phase Delay Retrieval

Zhao

Xia

et al. 2021

J. Lightwave Technol.

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A femtosecond laser metrology with nanometer precision and dynamic range of centimeter incorporating time-stretch interferometry and phase delay retrieval method is proposed and experimentally demonstrated. Displacement encoded phase-sensitive temporal interferogram is generated when phase stabilized femtosecond laser pulses transmitting through a time-stretch interferometer. To avoid the chirp of temporal interferogram due to high-order dispersion, time-to-frequency mapping is established to transform the temporal interferogram to the spectral interferogram for high-speed detection. The phase delay of spectral interferogram corresponding to specific displacements is retrieved and accumulated for linear fitting. The fitted slope is the time delay between two arms in the interferometer therefore displacement can be calculated. For precision verification, the preset displacements are measured. Mean error and standard deviation are presented after sliding average of measured results in 4 μs.

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“…In the past two decades, there has been much research and development in optical frequency synthesizers (OFSs), which are able to generate accurate and stable optical frequencies from a single microwave frequency reference. OFSs have enabled a wide range of applications in frequency metrology 1–3 , precise navigation 4–6 , optical spectroscopy 7–9 , microwave photonics 10–12 , and so on. However, applications are often limited to scientific experiments due to the size, weight, power consumption, and cost of OFSs.…”

Section: Introductionmentioning

confidence: 99%

Optical frequency synthesizer with an integrated erbium tunable laser

Xin

Singh

et al. 2019

Light Sci Appl

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Optical frequency synthesizers have widespread applications in optical spectroscopy, frequency metrology, and many other fields. However, their applicability is currently limited by size, cost, and power consumption. Silicon photonics technology, which is compatible with complementary-metal-oxide-semiconductor fabrication processes, provides a low-cost, compact size, lightweight, and low-power-consumption solution. In this work, we demonstrate an optical frequency synthesizer using a fully integrated silicon-based tunable laser. The synthesizer can be self-calibrated by tuning the repetition rate of the internal mode-locked laser. A 20 nm tuning range from 1544 to 1564 nm is achieved with ~10−13 frequency instability at 10 s averaging time. Its flexibility and fast reconfigurability are also demonstrated by fine tuning the synthesizer and generating arbitrary specified patterns over time-frequency coordinates. This work promotes the frequency stability of silicon-based integrated tunable lasers and paves the way toward chip-scale low-cost optical frequency synthesizers.

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Synthetic wavelength interferometry of an optical frequency comb for absolute distance measurement

Cited by 20 publications

References 37 publications

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Improved Algorithms of Data Processing for Dispersive Interferometry using Optical Frequency Comb

Nanometer Precision Time-Stretch Femtosecond Laser Metrology Using Phase Delay Retrieval

Optical frequency synthesizer with an integrated erbium tunable laser

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