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Micromachines
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Fiber Lasers and Applications
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Fiber Lasers and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 4254

Special Issue Editor

Prof. Dr. Haitao Zhang

E-Mail Website
Guest Editor
Institute of Laser and Photonics, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Interests: ultra-fast laser; high-energy fiber laser; image processing; laser biomedicine
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Fiber lasers have become increasingly popular for their unique properties and wide-ranging applications. With the ability to produce high-power and high-energy beams with exceptional beam quality, fiber lasers have been employed in various fields of industry and research, such as material processing, micromachining, sensing, biomedicine, and information science and technologies. One of the main advantages of fiber lasers is their superior efficiency and reliability compared to other types of lasers. Fiber lasers can also generate a broad range of wavelengths, from ultraviolet to mid-infrared, enabling a diverse range of applications. Recent developments in fiber laser technology have led to the creation of high-power and high-energy continuous wave, nanosecond, and ultra-fast fiber lasers from Gaussian beams to vector beams, from narrow-linewidth to supercontinuum spectrum, from spectral incoherent beams combining to coherently beam combining, which have opened up new possibilities for laser technology and applications. These lasers have found applications in areas such as ultra-fast spectroscopy, multiphoton microscopy, femtosecond micromachining, and high-precision material processing etc.

This Special Issue aims to present cutting-edge research articles on fiber lasers and their applications, highlighting the latest developments and trends in the field.

Prof. Dr. Haitao Zhang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • high-power and high-energy fiber lasers
  • fiber laser processing
  • applications of fiber lasers
  • ultra-fast fiber laser micromachining

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Published Papers (3 papers)

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Research

7 pages, 4175 KiB  
Communication
A High-Energy, Wide-Spectrum, Spatiotemporal Mode-Locked Fiber Laser
by Boyuan Ge, Yajun Lou, Silin Guo, Yue Cai and Xinhai Zhang
Micromachines 2024, 15(5), 644; https://doi.org/10.3390/mi15050644 - 12 May 2024
Cited by 1 | Viewed by 1137
Abstract
In this article, we demonstrate a high-energy, wide-spectrum, spatiotemporal mode-locked (STML) fiber laser. Unlike traditional single-mode fiber lasers, STML fiber lasers theoretically enable mode-locking with various combinations of transverse modes. The laser can deliver two different STML pulse sequences with different pulse widths, [...] Read more.
In this article, we demonstrate a high-energy, wide-spectrum, spatiotemporal mode-locked (STML) fiber laser. Unlike traditional single-mode fiber lasers, STML fiber lasers theoretically enable mode-locking with various combinations of transverse modes. The laser can deliver two different STML pulse sequences with different pulse widths, spectra and beam profiles, due to the different compositions of transverse modes in the output pulses. Moreover, we achieve a wide-spectrum pulsed output with a single-pulse energy of up to 116 nJ, by weakening the spectral filtering and utilizing self-cleaning. Strong spatial and spectral filtering are usually thought to be necessary for achieving STML. Our experiment verifies the necessity of spatial filtering for achieving STML, and we show that weakening unnecessary spectral filtering provides an effective way to increase the pulse energy and spectrum width of mode-locked fiber lasers. Full article
(This article belongs to the Special Issue Fiber Lasers and Applications)
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10 pages, 2730 KiB  
Article
Passively Q-Switched Er-Doped Fiber Laser Based on Bentonite Clay (Al2H2O6Si) Saturable Absorber
by Haroon Asghar, Umer Sayyab Khalid, Muhammad Sohail, Tahani A. Alrebdi, Zeshan A. Umar, A. M. Alshehri, Rizwan Ahmed and M. Aslam Baig
Micromachines 2024, 15(2), 267; https://doi.org/10.3390/mi15020267 - 13 Feb 2024
Cited by 2 | Viewed by 1336
Abstract
This paper presents the investigations toward the direct use of bentonite clay (Al2H2O6Si) nanoparticles to act like a saturable absorber (SA) for the Q-switched pulse operation of an erbium-doped fiber laser (EDFL). The measured results reveal that [...] Read more.
This paper presents the investigations toward the direct use of bentonite clay (Al2H2O6Si) nanoparticles to act like a saturable absorber (SA) for the Q-switched pulse operation of an erbium-doped fiber laser (EDFL). The measured results reveal that with the incorporation of bentonite clay nanopowder as a SA, an EDFL is realized with a Q-switching mechanism starting at a pump power of 30.8 mW, and a Q-switched emission wavelength was noticed at 1562.94 nm at 142 mW pump power. With an increased pump from 30.8 mW to 278.96 mW, the temporal pulse parameters including minimum pulse duration and maximum pulse repetition rates were reported as 2.6 µs and 103.6 kHz, respectively. The highest peak power, signal-to-noise ratio, output power and pulse energy were noticed to be 16.56 mW, 51 dB, 4.6 mW, and 47 nJ, respectively, at a highest pump power of 278.96 mW. This study highlights the significance of bentonite clay (Al2H2O6Si) nanoparticles as a potential candidate for a saturable absorber for achieving nonlinear photonics applications. Full article
(This article belongs to the Special Issue Fiber Lasers and Applications)
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28 pages, 17616 KiB  
Article
Novel Bidirectional Output Ytterbium-Doped High Power Fiber Lasers: From Continuous to Quasi-Continuous
by Lingfa Zeng, Xinyi Ding, Jiaqi Liu, Xiaolin Wang, Yun Ye, Hanshuo Wu, Peng Wang, Xiaoming Xi, Hanwei Zhang, Chen Shi, Fengjie Xi and Xiaojun Xu
Micromachines 2024, 15(1), 153; https://doi.org/10.3390/mi15010153 - 20 Jan 2024
Cited by 1 | Viewed by 1164
Abstract
Traditional ytterbium-doped high-power fiber lasers generally use a unidirectional output structure. To reduce the cost and improve the efficiency of the fiber laser, we propose a bidirectional output fiber laser (BOFL). The BOFL has many advantages over that of the traditional unidirectional output [...] Read more.
Traditional ytterbium-doped high-power fiber lasers generally use a unidirectional output structure. To reduce the cost and improve the efficiency of the fiber laser, we propose a bidirectional output fiber laser (BOFL). The BOFL has many advantages over that of the traditional unidirectional output fiber laser (UOFL) and has a wide application in the industrial field. In theory, the model of the BOFL is established, and a comparison of the nonlinear effect in the traditional UOFL and the BOFL is studied. Experimentally, high-power continuous wave (CW) and quasi-continuous wave (QCW) BOFLs are demonstrated. In the continuous laser, we first combine the BOFL with the oscillating amplifying integrated structure, and a near-single-mode bidirectional 2 × 4 kW output with a total power of above 8 kW is demonstrated. Then, with the simple BOFL, a CW bidirectional 2 × 5 kW output with a total power of above 10 kW is demonstrated. By means of pump source modulation, a QCW BOFL is developed, and the output of a near-single mode QCW laser with a peak output of 2 × 4.5 kW with a total peak power of more than 9 kW is realized. Both CW and QCW output BOFL are the highest powers reported at present. Full article
(This article belongs to the Special Issue Fiber Lasers and Applications)
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