Special Issue "Laser Crystals"

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: 30 June 2019

Special Issue Editor

Guest Editor
Dr. Inka Manek-Hönninger

Centre Lasers Intenses et Applications (CELIA) – UMR5107
University of Bordeaux
33405 Talence Cedex
France
Website | E-Mail
Interests: laser crystals; laser-matter interaction; optical material characterization; direct laser writing (DLW); waveguides; surface texturing with ultrafast lasers

Special Issue Information

Dear Colleagues,

Crystalline materials as active media are nowadays widely used in both, scientific and industrial laser sources and amplifier systems for a large variety of applications, including machining and micromachining of materials, medical surgery, security and defense, entertainment, and fundamental research. Thanks to their specific properties, arising from the host and active ion doping, laser crystals can respond to many different demands in terms of wavelength, output power and energy, and continuous wave or pulsed laser operation.

Research activities in the fields of new crystalline host matrices, doping and co-doping with different active ions, crystal structure and effects of laser crystals under polarized light are investigated. Exciting studies are carried out on power scaling, short-pulse generation and the research to access to new wavelengths.

The purpose of this Special Issue of Crystals dedicated to laser crystals is to collect papers either giving an overview of the state-of-the-art or reporting on recent advances in the study of laser crystals including, but not limited to, the topics mentioned below in the keyword list. Scientists and engineers working in the fields of laser crystals and their applications are cordially invited to contribute to this Special Issue.

Dr. Inka Manek-Hönninger
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 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. Crystals 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 1400 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

  • Laser crystals
  • New host matrices
  • Doping and co-doping
  • Crystal growth
  • Crystal characterization of optical properties
  • Polarization effects
  • Laser performances
  • New wavelengths
  • Short-pulse generation
  • Laser power scaling

Published Papers (3 papers)

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Research

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Open AccessArticle
Direct Amplification of High Energy Pulsed Laser in Fiber-Single Crystal Fiber with High Average Power
Crystals 2019, 9(4), 216; https://doi.org/10.3390/cryst9040216
Received: 22 March 2019 / Revised: 15 April 2019 / Accepted: 19 April 2019 / Published: 21 April 2019
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Abstract
A laser master oscillator power amplifier (MOPA) system consisting of a fiber amplifier and a two-stage Yb:YAG single crystal fiber (SCF) is experimentally studied. The nonlinear stimulated Raman scattering (SRS) is avoided by limiting the output power of the fiber preamplifier to 600 [...] Read more.
A laser master oscillator power amplifier (MOPA) system consisting of a fiber amplifier and a two-stage Yb:YAG single crystal fiber (SCF) is experimentally studied. The nonlinear stimulated Raman scattering (SRS) is avoided by limiting the output power of the fiber preamplifier to 600 mW. Due to the benefit from the low nonlinearity and high amplification gain of the SCF, a laser pulse duration of 16.95 ps and a high average power of 41.7 W at a repetition rate of 250 kHz are obtained by using a two-stage polarization controlled double-pass amplification of Yb:YAG SCF, corresponding to an output energy of 166.8 μJ and a peak power of 9.84 MW, respectively. The polarization controlled SCF amplification scheme achieved a gain as high as more than 69 times. During the amplification, the spectra gain narrowing effect and the polarization controlled four-pass amplification setup are also studied. The laser spectrum is narrowed from over 10 nm to less than 3 nm, and the pulse width is also compressed to hundreds of femtosecond by dechirping the laser pulse. This compact-sized, cost-effective laser source can be used in laser micromachining, or as the seeder source for generating much higher power and energy laser for scientific research. For some applications which need femtosecond laser, this laser source can also be compressed to femtosecond regime. Full article
(This article belongs to the Special Issue Laser Crystals)
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Open AccessArticle
New Sellmeier and Thermo-Optic Dispersion Formulas for AgGaS2
Crystals 2019, 9(3), 129; https://doi.org/10.3390/cryst9030129
Received: 22 January 2019 / Revised: 18 February 2019 / Accepted: 22 February 2019 / Published: 4 March 2019
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Abstract
This paper reports on the new Sellmeier and thermo-optic dispersion formulas that provide a good reproduction of the temperature-dependent phase-matching conditions for second-harmonic generation (SHG) and sum-frequency generation (SFG) of a CO2 laser and a Nd:YAG laser-pumped KTiOPO4 (KTP) optical parametric [...] Read more.
This paper reports on the new Sellmeier and thermo-optic dispersion formulas that provide a good reproduction of the temperature-dependent phase-matching conditions for second-harmonic generation (SHG) and sum-frequency generation (SFG) of a CO2 laser and a Nd:YAG laser-pumped KTiOPO4 (KTP) optical parametric oscillator (OPO) in the 0.8859–10.5910 μm range as well as those for difference-frequency generation (DFG) between the two diode lasers in the 4.9–6.5 μm range and DFG between the two periodically poled LiNbO3 (PPLN) OPOs in the 5–12 μm range thus far reported in the literature. Full article
(This article belongs to the Special Issue Laser Crystals)
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Review

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Open AccessReview
Laser Performance of Neodymium- and Erbium-Doped GYSGG Crystals
Crystals 2019, 9(4), 220; https://doi.org/10.3390/cryst9040220
Received: 28 February 2019 / Revised: 15 April 2019 / Accepted: 20 April 2019 / Published: 24 April 2019
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Abstract
Garnet crystals possess many properties that are desirable in laser host materials, e.g., they are suitable for diode laser (LD) pumping, stable, hard, optically isotropic, and have good thermal conductivity, permitting laser operation at high average power levels. Recently, a new garnet material, [...] Read more.
Garnet crystals possess many properties that are desirable in laser host materials, e.g., they are suitable for diode laser (LD) pumping, stable, hard, optically isotropic, and have good thermal conductivity, permitting laser operation at high average power levels. Recently, a new garnet material, GYSGG, was developed by replacing some of the yttrium ions (Y3+) with gadolinium ions (Gd3+) in YSGG, demonstrating great potential as a laser host material. GYSGG crystals doped with trivalent neodymium ion (Nd3+) and erbium ions (Er3+) were successfully grown for laser generation in the near- and mid-infrared range, with some of the laser performances reaching the level of mature laser gain media. This paper gives an overview of the achievements made in Nd3+- and Er3+-doped GYSGG lasers at different wavelength ranges. Additionally, full descriptions on Q-switching, mode-locking and wavelength-selecting methods for Nd:GYSGG, and the mechanisms of power scaling by co-doping sensitizers and deactivators in Er:GYSGG, are given. It is expected that this review will help researchers from related areas to quickly gain an understanding of these laser materials and promotes their commercialization and applications. Full article
(This article belongs to the Special Issue Laser Crystals)
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