Autonomous Differential Absorption Laser Device for Remote Sensing of Atmospheric Greenhouse Gases DOI Creative Commons
Panagiotis Siozos, Giannis Psyllakis, Peter C. Samartzis

et al.

Remote Sensing, Journal Year: 2022, Volume and Issue: 14(3), P. 460 - 460

Published: Jan. 19, 2022

A ground-based, integrated path, differential absorption (IPDA) light detection device capable of measuring multiple greenhouse gas (GHG) species in the atmosphere is presented. The was developed to monitor concentrations small-scale areas with high emission activities. It equipped two low optical power tunable diode lasers near-infrared spectral range for atmospheric carbon dioxide, methane, and water vapors (CO2, CH4 H2O). tested measurements background CO2 (Crete, Greece). Accuracies measurement retrievals were estimated at 5 ppm (1.2%) 50 ppb (2.6%), respectively. method that exploits intensity recorded H2O line combination weather (water vapor pressure, temperature, pressure) calculate GHG proposed. eliminates requirement laser beam propagation. Accuracy using 90 (4.8%). values calculated by proposed are agreement those obtained from LiDAR equation (DIAL).

Language: Английский

Frequency comb with a spectral range of 0.4–5.2 µm based on a compact all-fiber laser and LiNbO3 waveguide DOI
Lian Zhou,

Qin Xiong,

Yuanfeng Di

et al.

Optics Letters, Journal Year: 2023, Volume and Issue: 48(17), P. 4673 - 4673

Published: Aug. 15, 2023

This Letter presents a 0.4-5.2-µm frequency comb from compact laser. We designed an integrated fiber device for figure-9 laser and constructed all-fiber system. The spectrum of the was scaled to broadband region using chirped periodically poled lithium niobate waveguide. To use this system gas sensing, mid-infrared with spectral range 2.5-5.2 µm average power 2.1 mW divided optical filter. part packaged in 305 mm × 225 62 box. stabilized by locking repetition rate carrier-envelope offset seed source. provided ultrabroadband 0.4 5.2 µm, which could be applied spectroscopy, metrology, synthesizers.

Language: Английский

Citations

11
Recent Advances, Applications, and Perspectives in Erbium-Doped Fiber Combs DOI Creative Commons
Pengpeng Yan, Weiming Xu, Heng Hu

et al.

Photonics, Journal Year: 2024, Volume and Issue: 11(3), P. 192 - 192

Published: Feb. 21, 2024

Optical frequency combs have emerged as a new generation of metrological tools, driving advancements in various fields such free-space two-way time–frequency transfer, low-noise microwave source generation, and gas molecule detection. Among them, fiber based on erbium-doped mode-locked lasers garnered significant attention due to their numerous advantages, including low noise, high system integration, cost-effectiveness. In this review, we discuss recent developments analyze the advantages disadvantages constructing utilizing different lasers. First, provide brief introduction basic principles optical combs. Then, explore implemented mode-locking techniques, nonlinear polarization rotation (NPR), real saturable absorber (SA), amplifying loop mirror (NALM). Finally, present an outlook future perspectives

Language: Английский

Citations

4
On-the-fly precision spectroscopy with a dual-modulated tunable diode laser and Hz-level referencing to a cavity DOI Creative Commons
Shuangyou Zhang, Toby Bi, Pascal Del’Haye

et al.

Advanced Photonics, Journal Year: 2024, Volume and Issue: 6(04)

Published: Aug. 9, 2024

Advances in laser spectroscopy have enabled many scientific breakthroughs physics, chemistry, biology, and astronomy. Optical frequency combs pushed measurement limits with ultrahigh-frequency accuracy fast-measurement speed, while tunable-diode-laser is used scenarios that require high power continuous spectral coverage. Despite these advantages of spectroscopy, it challenging to precisely determine the instantaneous because fluctuations scan speed. Here, we demonstrate a simple scheme frequency-modulated diode references on-the-fly fiber cavity. The cavity's free range calibrated sub-10-Hz precision. We achieve relative precision 2×10−8 for an 11-THz at speed 1 THz/s. This improvement more than 2 orders magnitude compared existing diode-laser-spectroscopy methods. Our provides precise calibration markers, simultaneously tracking laser. versatility our method through various applications, including dispersion fiber, ultrahigh-Q microresonators, hydrogen fluoride gas cell. simplicity, robustness, low cost this are valuable out-of-the-lab applications like lidar environmental monitoring.

Language: Английский

Citations

4
Mid-infrared supercontinuum laser source with efficient spectral enhancement in 3.7 μm DOI
Xuan Wang,

Jichen Pan,

Chuanfei Yao

et al.

Optics Letters, Journal Year: 2025, Volume and Issue: 50(3), P. 872 - 872

Published: Jan. 3, 2025

A 3-5 µm mid-infrared (MIR) laser has a wide range of applications in biological tissue ablation, remote spectral fingerprint recognition, and directional infrared countermeasures. However, the performance conventional MIR lasers long been hindered by restricted wavelength radiation, power efficiency, system stability. Here, highly efficient, compact, stable light source is reported, which directly generated from supercontinuum (SC) with edge 4.2 7 core diameter fluorotellurite fiber. Based on integration high-peak-power pump small-core-diameter nonlinear medium, efficient frequency conversion traditional near-infrared to achieved, resulting significantly enhanced spectrum 3.7 µm, exceeding peak 2 more than 12 dB. The efficiency 50.8%, 94.3% distributed above 2.4 71.4% 3 µm. This study opened up feasible avenue for obtaining high-efficiency band that meet practical application needs.

Language: Английский

Citations

0
Modulated ringdown comb interferometry for sensing of highly complex gases DOI
Qizhong Liang,

Apoorva Bisht,

Andrew Scheck

et al.

Nature, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Language: Английский

Citations

0
Spatially resolved mass flux measurements with dual-comb spectroscopy DOI Creative Commons
David Yun, Ryan K. Cole, Nathan A. Malarich

et al.

Optica, Journal Year: 2022, Volume and Issue: 9(9), P. 1050 - 1050

Published: Aug. 19, 2022

Providing an accurate, representative sample of mass flux across large open areas for atmospheric studies or the extreme conditions a hypersonic engine is challenging traditional intrusive point-based sensors. Here, we demonstrate that laser absorption spectroscopy with mode-locked frequency combs can simultaneously measure all components (velocity, temperature, pressure, and species mole fraction) low uncertainty, spatial resolution corresponding to line sight, no supplemental sensor readings. The uncertainty provided by broad spectral bandwidth, high resolution, extremely well-known controlled axis stabilized, combs. We these capabilities using dual comb (DCS) in isolator ground-test supersonic propulsion at Wright-Patterson Air Force Base. measurements are consistent within 3.6% facility-level air supply values. A vertical scan beams measures spatially resolved flux, which compared computational fluid dynamics simulations. rigorous analysis demonstrates instrument ~0.4%, total (including non-instrument sources) ~7% measurements. These DCS as low-uncertainty variety applications.

Language: Английский

Citations

17
Apportionment and Inventory Optimization of Agriculture and Energy Sector Methane Emissions Using Multi‐Month Trace Gas Measurements in Northern Colorado DOI Creative Commons
Griffin Mead, Daniel I. Herman, Fabrizio R. Giorgetta

et al.

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(2)

Published: Jan. 9, 2024

Abstract Quantifying sector‐resolved methane fluxes in complex emissions environments is challenging yet necessary to improve inventories and guide policy. Here, we separate energy agriculture sector using a dynamic linear model analysis of methane, ethane, ammonia data measured at Northern Colorado site from November 2021 January 2022. By combining these sector‐apportioned observations with spatially resolved Bayesian inverse methods, are optimized across the study's ∼850 km 2 sensitivity area. Energy synthesized previous literature evaluate trends emissions. Optimized study area were 3.5× larger than inventory estimates; demonstrate this discrepancy consistent differences modeled versus real‐world spatial distribution agricultural sources. These results highlight how can yield multi‐sector optimizations environments.

Language: Английский

Citations

3
Ultra-Broadband Coherent Open-Path Spectroscopy for Multi-Gas Monitoring in Wastewater Treatment DOI Creative Commons
R. Krebbers, K. van Kempen, Yueyu Lin

et al.

Environmental Science and Ecotechnology, Journal Year: 2025, Volume and Issue: unknown, P. 100554 - 100554

Published: March 1, 2025

Wastewater treatment plants significantly contribute to greenhouse gas emissions, including nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4). Current methods measure these emissions typically target specific molecular compounds, providing limited scope potentially incomplete profiles. Here, we show an innovative ultra-broadband coherent open-path spectroscopy (COPS) system capable of simultaneously monitoring multiple gases. This novel approach combines Fourier transform with a coherent, mid-infrared light source spanning 2-11.5 μm at approximately 3 W power. Positioned above aeration tank, the COPS selectively detected absorption signatures for CH4, CO2, N2O, ammonia (NH3), monoxide (CO), water vapor (H2O), enabling real-time, path-integrated concentration measurements temporal resolution 40 s. Elevated concentrations CH4 CO2 were clearly identified within emission plumes traversing beam path tank. Additionally, patterns closely tracked variations in ammonium loading from incoming wastewater, whereas correlated strongly oxygen introduced during aeration. Measurements NH3, CO stable aligned traditional point-based commercial analyzers. Our findings demonstrate that offers robust, comprehensive solution simultaneous real-time gases complex heterogeneous environments. capability enhances atmospheric industrial assessments, transforming quantification environmental management.

Language: Английский

Citations

0
A 200 MHz Compact Environmentally-Stable Mode-Locked Figure-9 Fiber Laser DOI Creative Commons
Qinghui Deng,

Ke Yin,

Jianghua Zhang

et al.

IEEE photonics journal, Journal Year: 2021, Volume and Issue: 13(4), P. 1 - 5

Published: July 7, 2021

A compact environmentally-stable mode-locked figure-9 fiber laser is reported in this paper. The cavity composed of only two all-polarization-maintaining components, which enjoys a concise and stable structure. As result, vibration-immune fundamental single-pulse mode-locking operation can always be observed. pulse repetition rate was measured to 201.14 MHz much higher than the most previous works. output also have center wavelength/3-dB spectral bandwidth/radio frequency signal noise ratio/pulse width 1561.29 nm/20.97 nm/78 dB/510 fs, respectively. Besides, temperature test range 20 36 °C, together with 12-h performance explored. evolutions power, frequency, spectrum showed had excellent environmental stability, illustrating it as an easy-fabrication, ultrafast candidate for scientific area kind.

Language: Английский

Citations

22
Mid-IR tunable CW and passively Q-switched laser operation of Dy-doped fluoride fiber DOI Creative Commons
Yuchen Wang, Toney Teddy Fernandez, Pinghua Tang

et al.

Optical Materials Express, Journal Year: 2022, Volume and Issue: 12(4), P. 1502 - 1502

Published: Feb. 17, 2022

We report a comprehensive characterization of tunable continuous-wave (CW) and passive Q-switching laser performance Dy-doped zirconium fluoride fiber emitting around 3 µm. The in-band pumped CW operation is investigated for pump wavelengths varying from 2.7 µm to 2.825 µm, lengths ranging 0.4 m 2 m, output coupling efficiency 10% 50%, leading maximum slope 44% tuning range larger than 300 nm. With Findlay-Clay analysis Rigrod analyses, optimal cavity parameters are retrieved, paving the way further optimizations in performance. passively Q-switched achieved employing semiconductor saturable absorber mirror first time, demonstrating stable with minimum pulse duration 580 ns, highest repetition frequency 103 kHz energy up nJ.

Language: Английский

Citations

16