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Photonics
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Optical Fiber Lasers
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Optical Fiber Lasers

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 (31 October 2023) | Viewed by 5051

Special Issue Editor

Dr. Aleksey Ivanenko

E-Mail Website
Guest Editor
Senior Researcher, Research Units, Division of Laser Physics and Innovation Technologies Researcher, Research Units, Nonlinear Photonics Laboratory Senior Lecturer, Department of Physics, General Physics Section, Novosibirsk, Russia
Interests: fiber laser; laser pulses; mode-locked fiber laser

Special Issue Information

Dear Colleagues,

Optical Fiber Lasers are a popular laser source from both scientific and applied perspectives. The unique design flexibility of such laser sources offers various possible lasing regimes due to the unique adjustability of their parameters. Single-frequency, continuous-wave, mode-locked, q-switched, gain-modulated, gain-switched, as well as various mixed and transient lasing regimes, have been developed and exploited in relation to fiber laser sources. The availability of a number of different types of active fibers allows fiber lasers to operate at desirable wavelengths ranging from visible to mid-infrared. High efficiency and beam quality also make fiber lasers highly attractive for different industries. Moreover, fiber lasers often serve as a test bed for the experimental study of novel types of micro/nano-photonic devices and integrated optics. The continued development of photonic technologies and electronically controllable fiber components will lead to the establishment of qualitatively new methods of electronic (and even smart) control over laser parameters in different types of optical fiber lasers.

Topics of this Special Issue include but are not limited to the following:

Novel design of fiber lasers, novel types of fiber-optics elements and fiber-optics devices intended for fiber laser sources; novel physical aspects of lasing dynamics in pulsed fiber lasers; novel methods of static and dynamic control over lasing characteristics in fiber lasers; novel applications of fiber lasers; and novel findings obtained with the instrumental aid of fiber lasers.

If in doubt, potential authors are encouraged to contact the Guest Editors with questions concerning the suitability of their research for the Special Issue prior to submission.

Dr. Aleksey Ivanenko
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. 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

  • fiber lasers
  • fiber optics
  • active fiber
  • fiber amplifier
  • continuous wave
  • mode locking
  • nonlinear fiber optics

Published Papers (5 papers)

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Research

8 pages, 1417 KiB  
Communication
Widely Tunable Pulse Duration 100 mJ Single-Mode MOPA System Based on Yb-Doped Tapered Double-Clad Fiber and Nd:YAG Solid-State Amplifiers
by Mikhail Kozlyakov, Andrey Petrov and Grigoriy Mikhailovskiy
Photonics 2024, 11(1), 84; https://doi.org/10.3390/photonics11010084 - 17 Jan 2024
Viewed by 867
Abstract
We report on a 1064 nm master oscillator power amplifier (MOPA) system based on pulse-modulated laser diode seed sources combined with fiber preamplifiers and a Yb-doped tapered double-clad fiber (T-DCF) amplifier used as an all-fiber master oscillator and a two-stage side-pumped solid-state power [...] Read more.
We report on a 1064 nm master oscillator power amplifier (MOPA) system based on pulse-modulated laser diode seed sources combined with fiber preamplifiers and a Yb-doped tapered double-clad fiber (T-DCF) amplifier used as an all-fiber master oscillator and a two-stage side-pumped solid-state power amplifier. The combination of two master oscillators and a single power amplifier allowed us to obtain pulses with a duration ranging from 10 ns to 10 μs with energy up to 137 mJ at 100 Hz. For the first time, we demonstrate a widely tunable pulse duration and a solid-state MOPA system with over 100 mJ energy based on a T-DCF fiber seed laser. Full article
(This article belongs to the Special Issue Optical Fiber Lasers)
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10 pages, 6887 KiB  
Article
Fabrication of a Counter-Directional Pump/Signal Combiner with Built-In Mode Field Adapter
by Jiawei Wang, Zhixian Li, Min Fu, Xin Tian, Binyu Rao, Zilun Chen and Zefeng Wang
Photonics 2023, 10(11), 1214; https://doi.org/10.3390/photonics10111214 - 31 Oct 2023
Viewed by 902
Abstract
This article introduces a novel counter-directional pump/signal combiner with a built-in mode field adapter. This combiner offers additional functionality to address the problem of mode field mismatch between the gain fiber and delivery fiber, which occurs when using a large-core (50 μm) signal [...] Read more.
This article introduces a novel counter-directional pump/signal combiner with a built-in mode field adapter. This combiner offers additional functionality to address the problem of mode field mismatch between the gain fiber and delivery fiber, which occurs when using a large-core (50 μm) signal fiber to suppress stimulated Raman scattering. The combiner exhibits negligible degradation in beam quality as a result of implementing mode field matching and employing an effective feedback alignment technique. The beam quality of the mode field adapter integrated in the combiner is improved by 10%, compared to the conventional approach, thanks to the reduction in splicing points and the prevention of fusion loss caused by tapering-induced cladding diameter mismatch. The combiner demonstrates an average pump coupling efficiency of 98.5% and a temperature rise coefficient of less than 10 °C/kW without active cooling. Furthermore, an integrated device based on the combiner is fabricated to shorten the length of delivery fiber, therefore mitigating the effects of stimulated Raman scattering. All those techniques mentioned above are utilized in a narrow linewidth laser system, resulting in an output of approximately 5840 W with a nearly single-mode characteristic. Full article
(This article belongs to the Special Issue Optical Fiber Lasers)
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12 pages, 1842 KiB  
Article
Al2O3/GeO2/P2O5/F-Doped Silica Large-Mode-Area Optical Fibers for High-Power Single-Frequency Radiation Delivery
by Sergey Tsvetkov, Alexey Lobanov, Denis Lipatov, Maxim Khudyakov, Tatiana Zaushitsyna, Liudmila Iskhakova, Leonid Kotov and Mikhail Likhachev
Photonics 2023, 10(10), 1150; https://doi.org/10.3390/photonics10101150 - 13 Oct 2023
Cited by 3 | Viewed by 881
Abstract
A new design of a passive optical fiber waveguide with a large mode area (LMA) and strong stimulated Brillouin scattering (SBS) suppression is proposed. The fiber core consists of two parts: a central one, doped with Al2O3 and GeO2 [...] Read more.
A new design of a passive optical fiber waveguide with a large mode area (LMA) and strong stimulated Brillouin scattering (SBS) suppression is proposed. The fiber core consists of two parts: a central one, doped with Al2O3 and GeO2, and a peripheral one, doped with P2O5 and F. The doping profiles form a gradient-increasing profile of the acoustic refractive index, which effectively implements the acoustic multimode SBS suppression method. Measurements of the SBS gain spectrum and SBS threshold power were carried out, showing an increase in the SBS threshold of no less than 11 dB compared to a conventional uniformly doped passive LMA fiber. Full article
(This article belongs to the Special Issue Optical Fiber Lasers)
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12 pages, 5312 KiB  
Article
Backscattered Background Noise of the Lidar Ceilometer Influence Imposed by ASE in Single-Frequency Nanosecond Pulsed Laser at 1.5 μm
by Qi Gao, Gang Li, Xiangping Zhu, Zhe Li, Wei Zhao, Pei Ju, Wei Gao, Shengfei She and Wenjia Dang
Photonics 2023, 10(10), 1120; https://doi.org/10.3390/photonics10101120 - 5 Oct 2023
Viewed by 871
Abstract
In this work, we demonstrate a three-stage all-fiber master oscillator power amplifier (MOPA) system emitting over 1 W of the linearly polarized narrow-linewidth pulse output power with 10 kHz pulse repetition frequency and 400 ns pulse width without the amplified spontaneous emission (ASE) [...] Read more.
In this work, we demonstrate a three-stage all-fiber master oscillator power amplifier (MOPA) system emitting over 1 W of the linearly polarized narrow-linewidth pulse output power with 10 kHz pulse repetition frequency and 400 ns pulse width without the amplified spontaneous emission (ASE) at ~1.5 µm. Initially, we analyze the effect of the ASE on the first derivative of backscatter intensity via a contrast experiment. The experiment results show that the noise intensity with angle of inclination is affected by the ASE of the amplifier, thereby decreasing the signal-to-noise ratio of the output power. The laser is characterized by a very low or no ASE level of the output signal when acquiring the first derivative of backscatter intensity with low noise. This condition provides a reference for improving the properties of the laser used for cloud detection. Full article
(This article belongs to the Special Issue Optical Fiber Lasers)
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11 pages, 7493 KiB  
Communication
Tunable Random Fiber Laser Based on Dual-Grating Structure
by Yanan Niu, Pinggang Jia, Jianhui Su, Jingyi Wang, Guowen An, Qianyu Ren and Jijun Xiong
Photonics 2023, 10(6), 644; https://doi.org/10.3390/photonics10060644 - 2 Jun 2023
Cited by 4 | Viewed by 1154
Abstract
In order to reduce the pumping threshold and achieve a short-cavity single-mode transmission with a narrow-linewidth random fiber laser, we propose a tunable random fiber laser based on the combination of random grating and highly reflective fiber Bragg grating (FBG). Theoretical modeling of [...] Read more.
In order to reduce the pumping threshold and achieve a short-cavity single-mode transmission with a narrow-linewidth random fiber laser, we propose a tunable random fiber laser based on the combination of random grating and highly reflective fiber Bragg grating (FBG). Theoretical modeling of a random refractive index-modulated fiber grating was carried out. Random grating is regarded as a linear combination of uniform fiber gratings with different periods. Simulation calculations were performed using the transfer matrix method to determine the preparation parameters. Under the premise of satisfying light localization, a point-by-point method was used to write a random grating in a single-mode fiber using a femtosecond laser according to the simulated parameters. We constructed a random fiber laser with a linewidth of 1.68 kHz and a threshold of 29.2 mW using a random grating and a highly reflective FBG combined with an erbium-doped fiber. Due to the broad scattered wavelength range of the random grating, by changing the central wavelength of the high-reflection FBG, the tunable wavelength of the output laser was realized, and the tunable range was 0.847 nm (1549.110–1549.957 nm). Moreover, the laser’s central wavelength and output power are stable for a long time. Compared with other lasers, the proposed laser has the advantages of a lower threshold, shorter cavity length, narrower linewidth, and a relatively simple structure. Full article
(This article belongs to the Special Issue Optical Fiber Lasers)
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