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Photonics
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High-Power Lasers and Amplifiers
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High-Power Lasers and Amplifiers

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 2021) | Viewed by 14776

Special Issue Editors

Prof. Dr. Gilad Marcus

E-Mail Website
Guest Editor
Department of Applied Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Interests: highfield physics; ultrafast lasers; HHG; laser amplifiers; OPA; OPCPA;
Prof. Dr. Irina Sorokina

E-Mail Website
Guest Editor
NTNU Norwegian University of Science and Technology, Norway

Special Issue Information

Dear Colleague,

High-power lasers and amplifiers continue to be at the forefront of many scientific breakthroughs and technological achievements. Progress in the performance of these systems in terms of spectral coverage and tunability, average and peak power, conversion efficiency, etc. continue to open doors in many new and exciting interdisciplinary fields. In recent years we have been witnessing tremendous progress with NIR/Mid-IR lasers and amplifiers including new laser materials and new laser architecture, such as waveguide laser amplifiers. In this Special Issue on “High-Power Lasers and Amplifiers”, we aim to bring the most recent exciting developments in this field. Topics of interest include, but are not limited to, the following areas:

  • Laser amplifiers—scientific foundations;
  • Mid-IR light generation and amplification by laser;
  • New NIR/Mid-IR laser materials;
  • Short pulse (fs) laser amplifiers;
  • New methods for high energy mode-lock lasers;
  • High energy pulsed laser amplifiers—gas;
  • High energy pulsed laser amplifiers—solid state;
  • High-energy/high-power waveguide amplifiers;
  • KW-class laser amplifiers.

Prof. Dr. Gilad Marcus
Prof. Dr. Irina Sorokina
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.

Published Papers (5 papers)

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Research

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10 pages, 6381 KiB  
Article
2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression
by Xin Tian, Chenhui Gao, Chongwei Wang, Xiaofan Zhao, Meng Wang, Xiaoming Xi and Zefeng Wang
Photonics 2021, 8(12), 532; https://doi.org/10.3390/photonics8120532 - 25 Nov 2021
Cited by 6 | Viewed by 2631
Abstract
We report a high power, narrow linewidth fiber laser based on oscillator one-stage power amplification configuration. A fiber oscillator with a center wavelength of 1080 nm is used as the seed, which is based on a high reflection fiber Bragg grating (FBG) and [...] Read more.
We report a high power, narrow linewidth fiber laser based on oscillator one-stage power amplification configuration. A fiber oscillator with a center wavelength of 1080 nm is used as the seed, which is based on a high reflection fiber Bragg grating (FBG) and an output coupling FBG of narrow reflection bandwidth. The amplifier stage adopted counter pumping. By optimizing the seed and amplifier properties, an output laser power of 2276 W was obtained with a slope efficiency of 80.3%, a 3 dB linewidth of 0.54 nm and a signal to Raman ratio of 32 dB, however, the transverse mode instability (TMI) began to occur. For further increasing the laser power, a high-power chirped and tilted FBG (CTFBG) was inserted between the backward combiner and the output passive fiber, experimental results showed that both the threshold of Stimulated Raman scattering (SRS) and TMI increased. The maximum laser power was improved to 2576 W with a signal to Raman ratio of 42 dB, a slope efficiency of 77.1%, and a 3 dB linewidth of 0.87 nm. No TMI was observed and the beam quality factor M2 maintained about 1.6. This work could provide a useful reference for obtaining narrow-linewidth high-power fiber lasers with high signal to Raman ratio. Full article
(This article belongs to the Special Issue High-Power Lasers and Amplifiers)
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7 pages, 467 KiB  
Communication
An Electro-Optic, Actively Q-Switched Tm:YAP/KGW External-Cavity Raman Laser at 2273 nm and 2344 nm
by Rotem Nahear, Neria Suliman, Yechiel Bach and Salman Noach
Photonics 2021, 8(11), 519; https://doi.org/10.3390/photonics8110519 - 19 Nov 2021
Cited by 3 | Viewed by 1515
Abstract
This paper presents a KGW Raman laser with an external-cavity configuration in the 2 μm region. The Raman laser is pumped by unique, electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm. The electro-optic modulation is based on a KLTN crystal, enabling the [...] Read more.
This paper presents a KGW Raman laser with an external-cavity configuration in the 2 μm region. The Raman laser is pumped by unique, electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm. The electro-optic modulation is based on a KLTN crystal, enabling the use of a short crystal length, with a relatively low driving voltage. Due to the KGW bi-axial properties, the Raman laser is able to lase separately at two different output wavelengths, 2273 and 2344 nm. The output energies and pulse durations for these two lines are 0.42 mJ/pulse at 18.2 ns, and 0.416 mJ/pulse at 14.7 ns, respectively. This is the first implementation of a KGW crystal pumped by an electro-optic active Q-switched Tm:Yap laser in the SWIR spectral range. Full article
(This article belongs to the Special Issue High-Power Lasers and Amplifiers)
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Review

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20 pages, 23274 KiB  
Review
High-Power Solid-State Near- and Mid-IR Ultrafast Laser Sources for Strong-Field Science
by Andrey Pushkin, Ekaterina Migal, Dina Suleimanova, Evgeniy Mareev and Fedor Potemkin
Photonics 2022, 9(2), 90; https://doi.org/10.3390/photonics9020090 - 02 Feb 2022
Cited by 15 | Viewed by 2576
Abstract
This review highlights the development of ultrafast sources in the near- and middle-IR range, developed in the laboratory of Nonlinear Optics and Superstrong Laser Fields at Lomonosov Moscow State University. The design of laser systems is based on a powerful ultrafast Cr:Forsterite system [...] Read more.
This review highlights the development of ultrafast sources in the near- and middle-IR range, developed in the laboratory of Nonlinear Optics and Superstrong Laser Fields at Lomonosov Moscow State University. The design of laser systems is based on a powerful ultrafast Cr:Forsterite system as a front-end and the subsequent nonlinear conversion of radiation into the mid-IR, THz, and UV spectral range. Various schemes of optical parametric amplifiers based on oxide and non-oxide crystals pumped with Cr:Forsterite laser can receive pulses in the range of 4–6 µm with gigawatt peak power. Alternative sources of mid-IR ultrashort laser pulses at a relatively high (MHz) repetition rate are also proposed as difference frequency generators and as a femtosecond mode-locked oscillator based on an Fe:ZnSe crystal. Iron ion-doped chalcogenides (Fe:ZnSe and Fe:CdSe) are shown to be effective gain media for broadband high-peak power mid-IR pulses in this spectral range. The developed sources pave the way for advanced research in strong-field science. Full article
(This article belongs to the Special Issue High-Power Lasers and Amplifiers)
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23 pages, 1458 KiB  
Review
Power Scaling of CW Crystalline OPOs and Raman Lasers
by Soumya Sarang and Martin Richardson
Photonics 2021, 8(12), 565; https://doi.org/10.3390/photonics8120565 - 10 Dec 2021
Cited by 4 | Viewed by 2911
Abstract
Optical parametric oscillators (OPOs) and Raman lasers are two nonlinear-based laser technologies that extend the spectral range of conventional inversion lasers. Power and brightness scaling of lasers are significant for many applications in industry, medicine, and defense. Considerable advances have been made to [...] Read more.
Optical parametric oscillators (OPOs) and Raman lasers are two nonlinear-based laser technologies that extend the spectral range of conventional inversion lasers. Power and brightness scaling of lasers are significant for many applications in industry, medicine, and defense. Considerable advances have been made to enhance the power and brightness of inversion lasers. However, research around the power scaling of nonlinear lasers is lacking. This paper reviews the development and progress of output power of continuous-wave (CW) crystalline OPOs and Raman lasers. We further evaluate the power scalability of these two laser technologies by analyzing the cavity architectures and gain materials used in these lasers. This paper also discusses why diamond Raman lasers (DRLs) show tremendous potential as a single laser source for generating exceedingly high output powers and high brightness. Full article
(This article belongs to the Special Issue High-Power Lasers and Amplifiers)
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14 pages, 3449 KiB  
Review
Advances in All-Solid-State Passively Q-Switched Lasers Based on Cr4+:YAG Saturable Absorber
by Jingling Tang, Zhenxu Bai, Duo Zhang, Yaoyao Qi, Jie Ding, Yulei Wang and Zhiwei Lu
Photonics 2021, 8(4), 93; https://doi.org/10.3390/photonics8040093 - 27 Mar 2021
Cited by 11 | Viewed by 4442
Abstract
All-solid-state passively Q-switched lasers have advantages that include simple structure, high peak power, and short sub-nanosecond pulse width. Potentially, these lasers can be applied in multiple settings, such as in miniature light sources, laser medical treatment, remote sensing, and precision processing. Cr4+ [...] Read more.
All-solid-state passively Q-switched lasers have advantages that include simple structure, high peak power, and short sub-nanosecond pulse width. Potentially, these lasers can be applied in multiple settings, such as in miniature light sources, laser medical treatment, remote sensing, and precision processing. Cr4+:YAG crystal is an ideal Q-switch material for all-solid-state passively Q-switched lasers owing to its high thermal conductivity, low saturation light intensity, and high damage threshold. This study summarizes the research progress on all-solid-state passively Q-switched lasers that use Cr4+:YAG crystal as a saturable absorber and discusses further prospects for the development and application of such lasers. Full article
(This article belongs to the Special Issue High-Power Lasers and Amplifiers)
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