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Near/Mid-Infrared Lasers: Latest Advances and Applications
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Near/Mid-Infrared Lasers: Latest Advances and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: 30 October 2025 | Viewed by 1192

Special Issue Editors

Prof. Dr. Chen Chen

E-Mail Website
Guest Editor
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130061, China
Interests: infrared laser spectroscopy and sensing system
Special Issues, Collections and Topics in MDPI journals
Dr. Biao Wang

E-Mail Website
Guest Editor
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
Interests: infrared laser spectroscopy and sensing system

Special Issue Information

Dear Colleagues,

The burgeoning field of near- and mid-infrared (N/MIR) lasers continues to unveil groundbreaking applications across various scientific and industrial domains. This Special Issue on "Near/Mid-Infrared Lasers: Latest Advances and Applications" is a focused collection that delves into the burgeoning intersection of laser technology and precision measurement. It underscores the significance of laser interactions with molecules, atoms, and nuclei in advancing trace analysis and precision measurement methodologies. These advancements are set to revolutionize various sectors, including biology, geology, energy, environmental science, and space exploration. This Special Issue encourages submissions that contribute to the evolving body of knowledge in laser-based measurement systems, encompassing both theoretical explorations and empirical studies. It also welcomes comprehensive review articles that synthesize the current state of the field. The goal is to foster academic discourse and drive innovation in this dynamic area of research.

Prof. Dr. Chen Chen
Dr. Biao Wang
Guest Editors

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Keywords

  • novel near/mid-IR sources and techniques
  • nonlinear and laser materials for near/mid-IR
  • ultrashort near/mid-IR pulses and frequency combs
  • near/mid-IR supercontinuum generation
  • near/mid-IR fibers and fiber lasers
  • near/mid-IR integrated photonics
  • new sources and techniques for near/mid-IR spectroscopy
  • near/mid-IR sensing, imaging, and spectroscopy
  • strong-field physics pumped by near/mid-IR laser
  • biomedical applications of near/mid-IR lasers
  • novel techniques of near/mid-IR spectral and temporal measurement

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Published Papers (2 papers)

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Research

15 pages, 10639 KB  
Article
Waveform Self-Referencing Algorithm for Low-Repetition-Rate Laser Coherent Combination
by Zhuoyi Yang, Haitao Zhang, Dongxian Geng, Yixuan Huang and Jinwen Zhang
Appl. Sci. 2025, 15(19), 10430; https://doi.org/10.3390/app151910430 - 25 Sep 2025
Viewed by 237
Abstract
Indirect detection phase control algorithms, such as the dithering algorithm and the stochastic parallel gradient descent algorithm (SPGD), have simple system structures and are applicable to filled-aperture coherent combinations with high efficiency. The performances of these algorithms are limited when applied to a [...] Read more.
Indirect detection phase control algorithms, such as the dithering algorithm and the stochastic parallel gradient descent algorithm (SPGD), have simple system structures and are applicable to filled-aperture coherent combinations with high efficiency. The performances of these algorithms are limited when applied to a coherent combination of pulsed fiber lasers with a low repetition rate (≤5 kHz). Firstly, due to the overlap of the phase noise frequency and repetition rate, conventional algorithms cannot effectively distinguish the phase noise from the pulse fluctuation, and directly applying filtering will result in the phase information being filtered out. Secondly, if the pulse fluctuation is ignored and only the continuous part of the phase information is utilized, it relies on the presetting of conditions to separate the pulse from the continuous part and loses the phase information of the pulse part. In this article, we propose a waveform self-referencing algorithm (WSRA) based on a two-channel near-infrared laser coherent combination system to overcome the above challenges. Firstly, by modelling a self-referencing waveform, a nonlinear scaling operation is performed on the combined signal to generate a pseudo-continuous signal, which removes the intrinsic pulse fluctuation while preserving the phase noise information. Secondly, the phase control signal is calculated based on the pseudo-continuous signals after parallel perturbation. Finally, the phase noise is corrected by optimization. The results show that our method effectively suppresses the waveform fluctuation at a 5 kHz repetition rate, the light intensity reaches an ideal value (0.9939 Imax), and the root-mean-square (RMS) phase error is only 0.0130 λ. This method does not require the presetting of pulse detection thresholds or conditions, and solves the challenge of coherent combination at a low repetition rate, with adaptability to different pulse waveforms. Full article
(This article belongs to the Special Issue Near/Mid-Infrared Lasers: Latest Advances and Applications)
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13 pages, 2777 KB  
Article
Improving the Accuracy of Methane Sensor with Dual Measurement Modes Based on Off-Axis Integrated Cavity Output Spectroscopy Using White Noise Perturbation
by Ce Yang, Mingming Wen, Chen Chen, Chunguang Li, Jianyu Huang, Laiyong Song and Yu Li
Appl. Sci. 2025, 15(10), 5562; https://doi.org/10.3390/app15105562 - 15 May 2025
Viewed by 545
Abstract
A methane (CH4) sensor based on off-axis integrated cavity output spectroscopy (OA-ICOS) was developed, equipped with two measurement schemes: direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS). The sensor used an optical resonant cavity composed of two high reflection mirrors [...] Read more.
A methane (CH4) sensor based on off-axis integrated cavity output spectroscopy (OA-ICOS) was developed, equipped with two measurement schemes: direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS). The sensor used an optical resonant cavity composed of two high reflection mirrors (reflectivity > 99%). With a cavity length of 7 cm, an effective optical path length of 10.8 m and a cavity volume of 8.9 mL were achieved. A distributed feedback laser was used to precisely target the CH4 absorption line near 1.6537 µm. Compared with the original system, the cavity mode noise of the CH4 sensor was further reduced by adding white noise perturbations. The white noise perturbations were generated by the broadband random noise from the signal generator. The special customized narrowband RF noise source was not required. The system complexity and cost could be reduced. In DAS mode, the signal-to-noise ratio (SNR) of the OA-ICOS was 16.2 and the minimum detection limit (MDL) was 2.2 ppm at 117 s. In WMS mode, the SNR of the OA-ICOS was 113.9 and the MDL was 1.2 ppm at 106 s. Compared with the results obtained from the WMS mode and DAS mode, the SNR and MDL was improved 7.0 times and 1.8 times, respectively. The proposed sensor system not only enabled high-accuracy trace gas measurement, but also demonstrated strong potential for applications due to its compact design and low cost. Full article
(This article belongs to the Special Issue Near/Mid-Infrared Lasers: Latest Advances and Applications)
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