Special Issue "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).

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 papers will be 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 1600 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 (3 papers)

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Research

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Article
2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression
Photonics 2021, 8(12), 532; https://doi.org/10.3390/photonics8120532 (registering DOI) - 25 Nov 2021
Viewed by 188
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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Communication
An Electro-Optic, Actively Q-Switched Tm:YAP/KGW External-Cavity Raman Laser at 2273 nm and 2344 nm
Photonics 2021, 8(11), 519; https://doi.org/10.3390/photonics8110519 - 19 Nov 2021
Viewed by 195
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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Review
Advances in All-Solid-State Passively Q-Switched Lasers Based on Cr4+:YAG Saturable Absorber
Photonics 2021, 8(4), 93; https://doi.org/10.3390/photonics8040093 - 27 Mar 2021
Cited by 1 | Viewed by 789
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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