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Photonics
Special Issues
Cutting-Edge Developments in Fiber Laser
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Cutting-Edge Developments in Fiber Laser

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

Deadline for manuscript submissions: 15 March 2025 | Viewed by 6045

Special Issue Editors

Dr. Tianwei Jiang

E-Mail Website
Guest Editor
School of Electronic Engineering, University of Posts and Telecommunications, 10 Xitucheng Road, Beijing 100876, China .
Interests: fiber lasers; frequency combs; telecommunications; photonics time stretch; modulators; optical amplifiers
Dr. Ruihuan Wu

E-Mail Website
Guest Editor
School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
Interests: microwave photonics; optoelectronic oscillators; fiber lasers; radio frequency transfer; metasurface
Prof. Dr. Xuewen Shu

E-Mail Website
Guest Editor
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: fiber Bragg grating technology; optical fiber sensors; optical communication; fiber lasers; ultrafast lasers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The fiber laser is a well-known solid-state laser which uses doped fiber as a gain medium. Compared to other types of lasers, the unique properties of fiber lasers offer several advantages, such as high power, good beam quality, waveguide structure, high efficiency, reliability, and compact size. In recent years, the fiber laser is replacing traditional bulk lasers in many areas. In the industrial market, the fiber laser has become an essential tool in material processing, laser cutting, welding, marking, and telecommunications. It has been reported that the global fiber laser market was worth USD 3.3 billion in 2022. Furthermore, the expansion of applications in advance manufacturing, medical procedures, lidar systems, precise measurements, and sensor systems will boost the market to USD 9.2 billion by 2032. These figures can be attributed to the tremendous progress that has been made in other areas, such as linewidth, power, pulse width, robustness, and cost.

This Special Issue aims to track the recent developments of fiber lasers. In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Mode-locking techniques;
  • Narrow-linewidth lasers;
  • Optical frequency combs;
  • Mid-infrared fiber lasers;
  • Super continuum;
  • Q-switched fiber lasers;
  • Raman fiber lasers;
  • Semiconductor optical amplifiers;
  • Fiber laser applications;
  • Fiber laser and AI.

We look forward to receiving your contributions.

Dr. Tianwei Jiang
Dr. Ruihuan Wu
Prof. Dr. Xuewen Shu
Guest Editors

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. Photonics 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 2400 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

  • mid-infrared
  • fiber laser
  • ultrafast fiber laser
  • high power
  • narrow linewidth
  • super continuum
  • short-pulse generation
  • frequency comb
  • random laser

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Published Papers (6 papers)

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Research

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13 pages, 4053 KiB  
Article
In Situ Preparation of Thin-Film Q-Switches Based on Vanadium Dioxide for Pulsed Fiber Lasers
by Dmitriy P. Sudas, Sergei M. Popov and Petr I. Kuznetsov
Photonics 2025, 12(2), 133; https://doi.org/10.3390/photonics12020133 - 3 Feb 2025
Viewed by 156
Abstract
In the presented work, erbium fiber lasers operating in the pulsed mode with a nonlinear element containing a vanadium oxide saturable absorber are demonstrated. The structure of the saturable absorber is based on a segment of thinned silica fiber coated with a thin-film [...] Read more.
In the presented work, erbium fiber lasers operating in the pulsed mode with a nonlinear element containing a vanadium oxide saturable absorber are demonstrated. The structure of the saturable absorber is based on a segment of thinned silica fiber coated with a thin-film vanadium oxide by the method of metalorganic chemical vapor deposition. A fiber laser scheme is demonstrated that allows controlling the transmission of the internal cavity of the resonator during laser generation and deposition of a thin film. We have demonstrated a method for obtaining and annealing nanocoatings with laser generation control. We controlled the laser output parameters directly during the synthesis of the saturable absorber material. Vanadium oxides obtained in the work demonstrated the Mott–Paierls phase transition practically at room temperature. In this work, the optical characteristics of the output radiation of a fiber laser with a saturable absorber were measured. At temperatures above 70 °C, the coatings demonstrate a passive Q-switch with a repetition rate of 38 kHz and a pulse duration of 3.8 μs. At temperatures below the phase transition, a short-term mode-locking mode occurs. The transmission jump at a wavelength of about 1350 nm during structural rearrangement was 24%. For comparison, VO2 nanopowder in a polydimethylsiloxane elastomer matrix was used as a saturable absorber material. The nanopowder modulator made it possible to obtain pulses with a frequency of 27 kHz and a duration of about 7.2 μs. Full article
(This article belongs to the Special Issue Cutting-Edge Developments in Fiber Laser)
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15 pages, 12696 KiB  
Article
Coherence Properties of a Supercontinuum Generated by Cascade Raman Processes in a Hollow-Core Fiber Filled with a Mixture of Deuterium and Hydrogen
by Yury Yatsenko, Andrey Pryamikov and Alexey Gladyshev
Photonics 2024, 11(12), 1176; https://doi.org/10.3390/photonics11121176 - 14 Dec 2024
Viewed by 566
Abstract
Here, we report a numerical study of supercontinuum generation in an antiresonant optical fiber with a hollow core filled with a mixture of deuterium (D2) and hydrogen (H2). For 1 ps pulses at a wavelength of 1.03 μm with [...] Read more.
Here, we report a numerical study of supercontinuum generation in an antiresonant optical fiber with a hollow core filled with a mixture of deuterium (D2) and hydrogen (H2). For 1 ps pulses at a wavelength of 1.03 μm with different chirp values, we demonstrate a possibility of obtaining a mid-IR coherent supercontinuum with a spectral width of 2300 nm, initiated by cascade processes at resonance frequencies of vibrational and rotational levels of D2 and H2. We show that an increase in the chirped pulse duration to 25 ps while maintaining the energy and spectral width allows increasing the quantum conversion efficiency in the mid-IR from 10 to 50% and expanding the range of optimal fiber lengths at which a high degree of supercontinuum coherence is achieved. Full article
(This article belongs to the Special Issue Cutting-Edge Developments in Fiber Laser)
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12 pages, 3471 KiB  
Article
Erbium-Doped Tunable Fiber Laser Based on a Vernier Effect Filter
by Yuanzhen Liu, Hailong Xu, Kexin Zhu, Yicun Yao, Yuman Suo and Liqiang Zhang
Photonics 2024, 11(10), 979; https://doi.org/10.3390/photonics11100979 - 18 Oct 2024
Viewed by 877
Abstract
A novel vernier effect filter is designed utilizing two cascaded Mach–Zehnder interferometers (MZIs). Integrating the filter into an erbium-doped fiber laser (EDFL), the tunability of laser wavelength is achieved. Each MZI comprises two sequentially interconnected 3 dB optical couplers (OCs), where the incoming [...] Read more.
A novel vernier effect filter is designed utilizing two cascaded Mach–Zehnder interferometers (MZIs). Integrating the filter into an erbium-doped fiber laser (EDFL), the tunability of laser wavelength is achieved. Each MZI comprises two sequentially interconnected 3 dB optical couplers (OCs), where the incoming light is initially split into two arms at the first OC and subsequently recombined at the second OC. Interference occurs due to the optical path difference between these two beams. Notably, the two MZIs exhibit closely matched free spectral ranges (FSRs), leading to the formation of a broadened envelope in the superimposed spectrum. By delicately adjusting the optical path difference between the two arms of one MZI, a little drift of the interference spectrum is induced. This small amount of drift, in turn, triggers a significant movement of the envelope, giving rise to the so-called vernier effect. Integrating the vernier effect filter into an EDFL, the wavelength of the fiber laser can be tuned from 1542.56 nm to 1556.62 nm, with a tuning range of 14.06 nm. Furthermore, by employing a high-precision stepper motor, a remarkable tuning accuracy of 0.01 nm is attainable. The side mode suppression ratio of all wavelengths is above 55 dB. In comparison to reported tunable fiber lasers utilizing MZI filters, the proposed fiber laser in this study offers enhanced precision and a more user-friendly tuning process. Full article
(This article belongs to the Special Issue Cutting-Edge Developments in Fiber Laser)
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8 pages, 1830 KiB  
Article
Femtosecond Laser-Written Small-Period Long-Period Fiber Grating for an L-Band Normal Dispersion Mode-Locked Fiber Laser
by Qianying Li, Peiyun Cheng, Rong Zhao and Xuewen Shu
Photonics 2024, 11(8), 693; https://doi.org/10.3390/photonics11080693 - 25 Jul 2024
Cited by 1 | Viewed by 1073
Abstract
We utilize a femtosecond laser-inscribed small-period long-period fiber grating (SP-LPFG) to induce a nonlinear polarization rotation (NPR) effect for mode-locking pulses in a normal dispersion erbium-doped fiber laser (EDFL). The SP-LPFG has a length of 2.5 mm and a period of 25 μm. [...] Read more.
We utilize a femtosecond laser-inscribed small-period long-period fiber grating (SP-LPFG) to induce a nonlinear polarization rotation (NPR) effect for mode-locking pulses in a normal dispersion erbium-doped fiber laser (EDFL). The SP-LPFG has a length of 2.5 mm and a period of 25 μm. At wavelengths of 1556 nm and 1561 nm, it exhibits polarization-dependent loss (PDL) values of 20 dB and 14.5 dB, respectively, sufficient to trigger the NPR mechanism. With the pump power increased to 500 mW, the laser achieves normal dispersion mode-locked pulses centered at 1575 nm in the L-band, with a 3 dB bandwidth of 1.35 nm and a pulse width of 1.61 ps. The radio frequency (RF) spectrum reveals an signal-to-noise ratio (SNR) of up to 63.6 dB, demonstrating the excellent stability of the laser operation. This SP-LPFG holds promising applications, paving the way for efficient, compact, and stable normal dispersion ultrafast fiber lasers. Full article
(This article belongs to the Special Issue Cutting-Edge Developments in Fiber Laser)
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11 pages, 3607 KiB  
Article
Characterization of Single Frequency Fiber-Laser-Based Ultrasound Sensor
by Wei Zhu, Qiang Lu, Bo Yang, Rui Tian, Hao Luo, Chao Cai, Zhijun Yan and Luming Zhao
Photonics 2024, 11(7), 654; https://doi.org/10.3390/photonics11070654 - 11 Jul 2024
Viewed by 1433
Abstract
In this paper, we demonstrated a distributed feedback fiber-laser- (DFB-FL) based ultrasound detection system with a high signal-to-noise ratio (SNR), high sensitivity and wide frequency response range. The DFB-FL was fabricated by UV-inscribing a π phase-shifted grating in the Erbium–Ytterbium co-doped fiber using [...] Read more.
In this paper, we demonstrated a distributed feedback fiber-laser- (DFB-FL) based ultrasound detection system with a high signal-to-noise ratio (SNR), high sensitivity and wide frequency response range. The DFB-FL was fabricated by UV-inscribing a π phase-shifted grating in the Erbium–Ytterbium co-doped fiber using the phase mask method. The theory of DFB-FL and the sensing principle has been discussed and analyzed. The sensing signal was demodulated via an unbalanced Mach–Zehnder interferometer (MZI) system. The experimental results showed that the sensitivity of the sensor reached 75.18 mV/kPa and the flat frequency response range covered over 30 MHz, which covered the ultrasonic detection frequency range of abnormal discharge in the electric power system. The SNR of this DFB-FL was 42.9 dB, and the corresponding noise-equivalent pressure was calculated as 0.12 kPa. Full article
(This article belongs to the Special Issue Cutting-Edge Developments in Fiber Laser)
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Review

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18 pages, 1606 KiB  
Review
Recent Development of Fourier Domain Mode-Locked Laser
by Lu Chen, Hongcui Zhang, Song Yu, Bin Luo and Tianwei Jiang
Photonics 2024, 11(12), 1131; https://doi.org/10.3390/photonics11121131 - 29 Nov 2024
Viewed by 1323
Abstract
Since the advent of Fourier Domain Mode-Locked (FDML) lasers, they have demonstrated outstanding performance in several fields. They achieve high-speed, narrow-linewidth laser output with the new mode-locking mechanism, which has been intensively researched in the past decades. Compared with conventional wavelength-scanning light sources, [...] Read more.
Since the advent of Fourier Domain Mode-Locked (FDML) lasers, they have demonstrated outstanding performance in several fields. They achieve high-speed, narrow-linewidth laser output with the new mode-locking mechanism, which has been intensively researched in the past decades. Compared with conventional wavelength-scanning light sources, FDML lasers have successfully increased the scanning rate of frequency-sweeping lasers from kHz to MHz. They are widely used in optical coherence tomography, spectral analysis, microscopy, and microwave photonics. With the deepening research on FDML lasers, several performance metrics have been optimized and improved, offering superior performance for FDML laser-based applications. This paper reviews the principles and key performance indicators of FDML lasers, as well as the recent progress made in some important applications, and highlights further research directions for FDML lasers in the future. Full article
(This article belongs to the Special Issue Cutting-Edge Developments in Fiber Laser)
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