Enhanced spectral resolution in mid-infrared dual-comb spectroscopy via synchronous offset frequency tuning DOI Creative Commons
Bocheng Tang,

Zhong Zhou Yi,

Qingzhao Yang

et al.

Optics Express, Journal Year: 2024, Volume and Issue: 33(1), P. 910 - 910

Published: Dec. 19, 2024

Mid-infrared dual-comb spectroscopy offers significant advantages by combining the high sensitivity of mid-infrared with spectral resolution and rapid acquisition method. However, its effective resolution, constrained inherent comb line spacing, hinders ability to resolve narrow absorption features, common in critical applications such as sub-Doppler spectroscopy, low-pressure gas analysis, construction atmospheric profile. To address this challenge, we present a synchronous offset frequency tuning method for system improve far beyond spacing. In our system, source is generated from near-infrared continuous-wave pump laser via difference generation single periodically poled lithium niobate bulk. By adjusting phase-lock one combs, synchronously tune frequencies both combs without changing source. We demonstrated that enabled overlapped lines ethane around 3000 cm-1, achieving uniform sampling interval 10 MHz interleaved spectrum 25-fold enhancement resolution. This approach allows sub-MHz any modifications data offering possibilities high-precision analysis.

Language: Английский

Design and Analysis of Terahertz Wave All-Dielectric Grating Magnetic Reflector DOI

Yijie Tong,

Xudong Qiu,

Bin Lou

et al.

Journal of Electronic Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 22, 2025

Language: Английский

Citations

0
Design of a Polarization-Insensitive and Wide-Angle Triple-Band Metamaterial Absorber DOI Creative Commons

Shaoxin Zheng,

Manna Gu,

Guilan Feng

et al.

Photonics, Journal Year: 2025, Volume and Issue: 12(4), P. 386 - 386

Published: April 16, 2025

This paper proposes a tri-band wide-angle polarization-insensitive absorber operating in the C-band and Ku-band, based on design concept of metal–dielectric–metal. The achieves absorption efficiencies 99.05%, 99.3%, 97.9% at 4.23 GHz, 7.403 14.813 respectively. first two frequencies are C-band, while third frequency is both which commonly used satellite communication. designed consists three differently sized regular hexagonal rings. To analyze interaction mechanism between electromagnetic wave absorber, we applied theory impedance matching equivalent media to metamaterial properties absorber. In addition, circuit model has been analyzed. We then determined existence coupled resonances top bottom surfaces by analyzing distribution electric field, magnetic surface currents By varying polarization angle incident incoming wave, found that exhibits insensitivity characteristics. TE TM waves maintain more than 90% efficiency up angles 50° 60°, absorber’s thickness 1.07 mm, 0.0154 times wavelength corresponding lowest resonant (λ0), edge length subunit’s hexagon 7.5 mm (0.108λ0), making sub-wavelength scale maintaining its compactness. proposed operates can be field communications, achieving functions such as shielding stealth.

Language: Английский

Citations

0
Large-angle directional scattering of terahertz beams based on all-dielectric metasurface DOI
Fuhai Liu, Yanling Li, Yong Tao

et al.

The European Physical Journal D, Journal Year: 2025, Volume and Issue: 79(5)

Published: May 1, 2025

Language: Английский

Citations

0
Convolutional neural network for coded metasurface inverse design DOI
Yong Tao, Xudong Qiu, Fuhai Liu

et al.

Applied Physics B, Journal Year: 2025, Volume and Issue: 131(6)

Published: May 10, 2025

Language: Английский

Citations

0
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） DOI
陈晨 Chen Chen,

罗万里 Luo Wanli,

刘雪明 Liu Xueming

et al.

Acta Optica Sinica, Journal Year: 2024, Volume and Issue: 44(17), P. 1732013 - 1732013

Published: Jan. 1, 2024

Citations

0
Effective sensitization of Dy3+:6H11/2 energy level by Tm3+ ions in KPb2Br5 crystal for 4.3 μm lasers DOI
Xia-Ji Liu, Mingzhu He,

Qiannan Fang

et al.

Optics Letters, Journal Year: 2024, Volume and Issue: 49(24), P. 7036 - 7036

Published: Nov. 27, 2024

To the best of our knowledge, this is first study to investigate use Tm

Language: Английский

Citations

0
Evaluating the Impact of Water Vapor for Aerosol and Carbon Dioxide Detection Lidar CO₂ Measurement Onboard the Atmospheric Environment Monitoring Satellite DOI Creative Commons
Cheng Chen, Chuncan Fan, Zitong Wu

et al.

Optics Express, Journal Year: 2024, Volume and Issue: 32(27), P. 48340 - 48340

Published: Dec. 10, 2024

Global warming, driven by greenhouse gas emissions from human activities, poses significant environmental challenges. Accurate measurement data are crucial for effective emission reduction policies and international cooperation. The spaceborne integrated path differential absorption lidar offers high precision monitoring global atmospheric carbon dioxide (CO2) concentrations on both days nights. However, its accuracy can be compromised water vapor interference. We evaluated the impact of CO2 detection, focusing measurements an aerosol detection onboard environment satellite. bias due to was negligible. broadened spectrum, causing molecular interference, which could introduce considerable column (XCO2) bias. In areas with vapor, exceed 1 ppm. Globally, annual average XCO2 broadening effects 0.42 analysis highlights importance account spectrum effects, not only in such as ACDL but also other techniques improve enhance our understanding climate change cycles.

Language: Английский

Citations

0
Enhanced spectral resolution in mid-infrared dual-comb spectroscopy via synchronous offset frequency tuning DOI Creative Commons
Bocheng Tang,

Zhong Zhou Yi,

Qingzhao Yang

et al.

Optics Express, Journal Year: 2024, Volume and Issue: 33(1), P. 910 - 910

Published: Dec. 19, 2024

Mid-infrared dual-comb spectroscopy offers significant advantages by combining the high sensitivity of mid-infrared with spectral resolution and rapid acquisition method. However, its effective resolution, constrained inherent comb line spacing, hinders ability to resolve narrow absorption features, common in critical applications such as sub-Doppler spectroscopy, low-pressure gas analysis, construction atmospheric profile. To address this challenge, we present a synchronous offset frequency tuning method for system improve far beyond spacing. In our system, source is generated from near-infrared continuous-wave pump laser via difference generation single periodically poled lithium niobate bulk. By adjusting phase-lock one combs, synchronously tune frequencies both combs without changing source. We demonstrated that enabled overlapped lines ethane around 3000 cm-1, achieving uniform sampling interval 10 MHz interleaved spectrum 25-fold enhancement resolution. This approach allows sub-MHz any modifications data offering possibilities high-precision analysis.

Language: Английский

Citations

0