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11 pages, 2104 KiB

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A 30 mW Laser Oscillator at 2.72 μm and 2.8 μm Wavelengths Based on Er³⁺-Doped Tungsten–Tellurite Fibers

by Sergei Muraviev, Vitaly Dorofeev, Sergei Motorin, Maxim Koptev and Arkady Kim

Photonics 2024, 11(12), 1159; https://doi.org/10.3390/photonics11121159 - 9 Dec 2024

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The purpose of this paper was to develop fiber lasers in the 2.7–2.8 μm range based on the tungsten–tellurite glass fiber that is technically robust compared to the other fibers currently used in laser engineering. Using an advanced technology for producing ultra-dry tellurite glasses, we manufactured Er³⁺-doped tungsten–tellurite glass preforms with extremely low absorption and obtained active single-mode tungsten–tellurite fibers. Based on a 70 cm long fiber, we developed a laser oscillator pumped by a low-cost, high-efficiency diode laser at 976 nm. At the highest used pump power, the laser output reached 33 mW, which may be interesting for practical applications. We also measured the single-pass on/off gain of the fibers and showed that with increasing pump power amplification, as high as 5 can be reached, showing that such active fibers may also be used for increasing laser output. Full article

(This article belongs to the Special Issue Single Frequency Fiber Lasers and Their Applications)

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16 pages, 3525 KiB

Open AccessReview

Rare-Earth-Doped Selenide Glasses as Laser Materials for the 5–6 μm Spectral Range

by Boris Denker, Peter Fjodorow, Mikhail Frolov, Boris Galagan, Vasily Koltashev, Victor Plotnichenko, Maxim Sukhanov, Sergei Sverchkov and Alexander Velmuzhov

Photonics 2023, 10(12), 1323; https://doi.org/10.3390/photonics10121323 - 29 Nov 2023

Cited by 10 | Viewed by 2468

Abstract

This paper provides an overview of mid-infrared lasers based on rare-earth-ion-doped selenide glasses. Laser action was demonstrated at the transitions between the first excited and the ground levels of Ce³⁺, Pr³⁺, Nd³⁺ and Tb³⁺ ions. The highest output parameters for bulk glass lasers (over 40 mJ of output energy) and wavelength tuning in the range of 4.6–5.6 microns were obtained with Ce³⁺-doped glass. The highest output parameters for fiber lasers (150 mW at 5.1–5.3 μm under continuous pumping) were demonstrated with Tb³⁺ ions. The longest lasing wavelengths for any glass laser and tunability within the 5.56–6.01 µm spectral band were shown with Nd³⁺ ions in a Tb³⁺-Nd³⁺ co-doped system. Full article

(This article belongs to the Special Issue Advanced Solid-State and Fiber Mid-IR Lasers: Novel Materils, Components, Systems and Applications)

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13 pages, 5396 KiB

Open AccessArticle

Broadband Amplification in the 2.6–2.9 μm Wavelength Range in High-Purity Er³⁺-Doped Zinc-Tellurite Fibers Pumped by Diode Lasers

by Sergei Muraviev, Vitaly Dorofeev, Pavel Kuznechikov, Artem Sharafeev, Maksim Koptev and Arkady Kim

Photonics 2023, 10(10), 1140; https://doi.org/10.3390/photonics10101140 - 11 Oct 2023

Cited by 1 | Viewed by 1428

Abstract

In recent years, great progress has been made in the technology of high-purity and ultra-dry tellurite glasses, which has enabled the creation of high-purity single-mode tellurite fibers doped with rare-earth ions. This technology has made it possible to demonstrate laser generation in the range of about 2.7 μm in erbium-doped tungsten tellurite fibers. In this paper, we present an experimental study of broadband amplification in erbium-doped zinc-tellurite fibers. Zinc-tellurite glasses containing modifying components, such as Na₂O, La₂O₃, Bi₂O₃, or rare-earth metal oxides, are known to have noticeably lower phonon energy than heavy metal-tellurite systems, namely, tungsten tellurite glasses, which leads to better lasing output. The on-off gain of 30- and 60-cm long zinc-tellurite fibers has been measured in a wide range of diode pump powers. It has been shown for the first time that the amplification band is essentially extended, with pump power reaching over 250 nm (2600–2850 nm) at a peak power of about 40 W for a 30-cm long fiber. Full article

(This article belongs to the Special Issue Advanced Solid-State and Fiber Mid-IR Lasers: Novel Materils, Components, Systems and Applications)

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