Sub-100 fε resolution strain sensing based on optical fiber frequency comb

Optics Express, Год журнала: 2025, Номер 33(7), С. 14655 - 14655

Опубликована: Фев. 21, 2025

In this paper, we report a high-resolution optical fiber strain sensing system based on frequency comb (OFC) beat-frequency demodulation. This enables both static and dynamic detection, featuring large measurement range spectral range. The sensor employed Fabry-Perot interferometer (FFPI) as the element, which was probed by narrow-linewidth laser stabilized to it. By leveraging concept of beat demodulation, OFC, translated shifts within into radio (RF) for detection. Our findings revealed resolution 247 pε, 87 fε/Hz1/2 at 8 kHz, 10 it be far away from low-frequency noise. Additionally, investigated potential free-running OFC with stable repetition rate sensing. actively sweeping OFC's offset in conjunction FFPI, achieved 630 pε. offers high resolution, moderate cost, degree portability, rendering suitable geophysical research applications.

Язык: Английский

Near- to mid-IR spectral purity transfer with a tunable frequency comb: Methanol frequency metrology over a 1.4 GHz span

APL Photonics, Год журнала: 2024, Номер 9(3)

Опубликована: Март 1, 2024

We report the upgrade and operation of a frequency-comb-assisted high-resolution mid-infrared molecular spectrometer, allowing us to combine high spectral purity, International System Units (SI)-traceability, wide tunability, sensitivity. An optical frequency comb is used transfer purity SI-traceable 1.54 μm metrology-grade reference 10.3 quantum cascade laser (QCL). The near-infrared operated at French time/frequency metrology institute, calibrated there primary standards, transferred Laboratoire de Physique des Lasers via REFIMEVE fiber network. QCL exhibits linewidth δν ∼ 0.1 Hz sub-10−15 relative stability from 10 s, its traceable SI with total uncertainty better than 4 × 10−14 after 1 s averaging time. have developed instrumentation modes be continuously tuned over 9 GHz, resulting in record uninterruptedly tunable precision an unprecedented span Δν = 1.4 GHz. our apparatus conduct sub-Doppler spectroscopy methanol multi-pass cell, demonstrating state-of-the-art uncertainties down few kilohertz level (∼10−10 value). observed weak intensity resonances unreported so far, resolved subtle doublets never seen before, brought light discrepancies HITRAN. This demonstrates potential for probing internal processes, building accurate spectroscopic models polyatomic molecules atmospheric or astrophysical interest, carrying out precise tests fundamental physics.

Язык: Английский

基于超快光纤光源的脉冲内差频产生中红外激光的研究进展（特邀）

Acta Optica Sinica, Год журнала: 2024, Номер 44(17), С. 1732013 - 1732013

Опубликована: Янв. 1, 2024