The Emerging Science and Applications of Fiber Laser Technology

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Lasers, Light Sources and Sensors".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 5619

Special Issue Editors

School of Mechanical and Electrical Engineering, Xingtai University, Xingtai, China
Interests: optical fiber laser; optical fiber components; optical fiber sensing
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Guest Editor
Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, China
Interests: optical vortex; optical fiber laser; optical fiber communication and fiber based devices

Special Issue Information

Dear Colleagues,

Like other varieties of laser, fiber lasers consist of three parts: gain medium, pump source, and resonant cavity. Fiber lasers use active fibers doped with rare earth elements in the fiber core as a gain medium. Generally, semiconductor lasers are used as pump sources. The resonant cavity is generally composed of devices such as mirrors, fiber end faces, optical filters, or fiber gratings.

Fiber lasers possess the advantages of high output power, excellent beam quality, narrow linewidth, good heat dissipation performance, compact structure, etc., and are growing more and more important in scientific research and industrial production.

Until now, various kinds of fiber lasers have been proposed for the application of optical imaging, material processing, high-precision sensing, optical fiber communication, spectroscopy, microwave generation, laser-based medical treatments, and a variety of other uses. For example, ultra-narrow linewidth fiber lasers are attractive for usage in high-resolution acoustic sensing and 2 μm fiber lasers are interesting in atmospheric applications. Thus, this technology is of vital importance for the investigation of various kinds of fiber lasers and their wide applications.

Both original research papers and review papers are welcome. Potential technical topics include, but are not limited, to the following areas of study:

  • Fiber lasers operating in various wavebands, including 1.0 μm, 1.5 μm, 2.0 μm and above;
  • New mechanisms in fiber lasers, including power amplification, linewidth narrowing, wavelength tuning and so on;
  • Various applications of fiber lasers in scientific research, including optical imaging, material processing, high precision sensing, optical fiber communication, spectroscopy, microwave generation, laser medical and so on;
  • Application of fiber lasers in industry, including cutting, welding, marking and so on;
  • Mode-locked fiber laser, wavelength tunable and switchable fiber laser and so on;
  • Design and fabrication of various fibers used for emerging science and applications of fiber laser.

Dr. Qi Qin
Dr. Youchao Jiang
Guest Editors

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Keywords

  • fiber laser
  • application of fiber laser
  • laser imaging
  • laser medical
  • laser material processing
  • optical fiber laser sensing

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Published Papers (4 papers)

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Research

11 pages, 3542 KiB  
Article
Bend Distortion and Thermal Lensing Effect on Transverse Mode Instability
by Dan Cheng, Qing Zhong, Yujun Feng, Kun Zhang, Zhaochen Cheng, Dayong Zhang and Hong Zhao
Photonics 2024, 11(12), 1104; https://doi.org/10.3390/photonics11121104 - 22 Nov 2024
Viewed by 727
Abstract
In this work, we conducted a numerical analysis to investigate the combined effect of thermal lensing and bending-induced mode distortion on transverse mode instability in conventional large-mode-area (LMA) step-index fibers. Utilizing the finite element method, conformal mapping, and thermal conduction equations, we simulated [...] Read more.
In this work, we conducted a numerical analysis to investigate the combined effect of thermal lensing and bending-induced mode distortion on transverse mode instability in conventional large-mode-area (LMA) step-index fibers. Utilizing the finite element method, conformal mapping, and thermal conduction equations, we simulated the mode profiles in LMA 20/400 and 25/400 fibers subjected to both bending and thermal lensing effects; the corresponding evolution of mode loss and effective area were explored as well. Additionally, by introducing the derived mode profiles to the TMI coefficient calculations, we analyzed the influence of bending and thermal lensing (TL) on TMI; the simulation results indicate that the mode distortion caused by bending and the TL effect, under the bending conditions commonly encountered in practice, do not have pronounced impacts on TMI coefficient and TMI threshold. Full article
(This article belongs to the Special Issue The Emerging Science and Applications of Fiber Laser Technology)
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10 pages, 542 KiB  
Article
An Efficient Hybrid Method for Calculating the Focal Field of a Cassegrain Antenna
by Hongfei Lian, Yanwen Jiang, Dawei Lu, Huaitie Xiao and Hongqi Fan
Photonics 2024, 11(9), 832; https://doi.org/10.3390/photonics11090832 - 3 Sep 2024
Viewed by 1116
Abstract
The evaluation of the focal field of Cassegrain antennas is crucial for the design and optimization of the complex feeds in quasi-optical systems. However, employing traditional physical optics methods generates high computational complexity and is inefficient. An accurate and efficient calculation method of [...] Read more.
The evaluation of the focal field of Cassegrain antennas is crucial for the design and optimization of the complex feeds in quasi-optical systems. However, employing traditional physical optics methods generates high computational complexity and is inefficient. An accurate and efficient calculation method of Cassegrain antennas’ focal fields that involves a range of incidence angles is proposed, which integrates ray tracing and vector diffraction integration (RT-VDI) theories. It can calculate the focal field in any given or predefined incident direction, not limited to the case of axial incidence. In addition, the use of the equivalent parabolic theory greatly simplifies the process of integral calculation. Moreover, ray tracing and integration operations are executed upon the calculation of the reflector to further improve efficiency. Numerical examples are presented to demonstrate the accuracy and efficiency of the proposed method. Full article
(This article belongs to the Special Issue The Emerging Science and Applications of Fiber Laser Technology)
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13 pages, 12033 KiB  
Article
Ytterbium-Doped Double-Clad Fiber with High Uniformity of Concentration Distribution and Suppressed Photodarkening
by Yongqing Yi, Yize Shen, Pengcheng Geng, Rong Pan, Shijie Xu and Ruifang Luo
Photonics 2024, 11(6), 565; https://doi.org/10.3390/photonics11060565 - 17 Jun 2024
Cited by 2 | Viewed by 1333
Abstract
Photodarkening (PD) effect in ytterbium-doped fiber (YDF) has a significant impact on the high-power operational stability of fiber lasers, which seriously hinders the power scaling. In this paper, the relationship between ytterbium ions uniformity and the photodarkening effect in the YDF was investigated, [...] Read more.
Photodarkening (PD) effect in ytterbium-doped fiber (YDF) has a significant impact on the high-power operational stability of fiber lasers, which seriously hinders the power scaling. In this paper, the relationship between ytterbium ions uniformity and the photodarkening effect in the YDF was investigated, and the fabrication process allowing improving the ytterbium ions uniformity in the core of preforms for suppressing the photodarkening effect was developed. The Modified Chemical Vapor Deposition (MCVD) method combined with Chelate Vapor Deposition (CVD) technology was adopted for multi-layer fiber core deposition, and an all-gas-phase technical process was proposed to improve the ytterbium ions uniformity in the Al/P co-doped glass matrix. The 25/400 μm YDFs obtained by this technology achieved stable 3.5 kW laser output power for 8 h with suppressed PD and nonlinear effects. Full article
(This article belongs to the Special Issue The Emerging Science and Applications of Fiber Laser Technology)
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12 pages, 42822 KiB  
Communication
Analyzing Vortex Light Beam Scattering Characteristics from a Random Rough Surface
by Xiaoxiao Zhang, Xiang Su, Zhensen Wu and Shanzhe Wang
Photonics 2023, 10(9), 955; https://doi.org/10.3390/photonics10090955 - 22 Aug 2023
Cited by 3 | Viewed by 1717
Abstract
The propagation and scattering of vortex light beams in complex media have significant implications in the fields of laser imaging, optical manipulation, and communication. This paper investigates the scattering characteristics of vortex light beams from a random rough surface. Firstly, a two-dimensional Gaussian [...] Read more.
The propagation and scattering of vortex light beams in complex media have significant implications in the fields of laser imaging, optical manipulation, and communication. This paper investigates the scattering characteristics of vortex light beams from a random rough surface. Firstly, a two-dimensional Gaussian rough surface is generated using the Monte Carlo method combined with the linear filtering method. Subsequently, the vortex beams are decomposed into the superposition of infinite plane waves, and the scattering of each plane wave from the rough surface is calculated using the Kirchhoff Approximation method. Numerical results of the angle distribution and spatial distribution of OAM scattering Laser Radar Cross Section (LRCS) are presented, varying with different surface roughness parameters for a rough aluminum surface and the beam’s parameters. The results demonstrate that the scattering of vortex beams is influenced by the beam’s parameters, such as Orbital Angular Momentum (OAM) mode number and elevation angle, which may bring new insights into vortex wave-matter interactions and their applications in high resolution imaging. Full article
(This article belongs to the Special Issue The Emerging Science and Applications of Fiber Laser Technology)
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