Optimization of the Core Compound for Ytterbium Ultra-Short Cavity Fiber Lasers

Highly ytterbium-, aluminum- and phosphorus-co-doped silica fibers with low optical losses were fabricated by the MCVD method, utilizing an all-gas-phase deposition technique. Optical and laser properties of the active fibers with a phosphosilicate and aluminophosphosilicate glass cores doped with 1...

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Bibliographic Details
Main Authors: Andrey Rybaltovsky, Mikhail Yashkov, Alexey Abramov, Andrey Umnikov, Mikhail Likhachev, Denis Lipatov
Format: Article
Language:English
Published: MDPI AG 2023-06-01
Series:Fibers
Subjects:
Online Access:https://www.mdpi.com/2079-6439/11/6/52
Description
Summary:Highly ytterbium-, aluminum- and phosphorus-co-doped silica fibers with low optical losses were fabricated by the MCVD method, utilizing an all-gas-phase deposition technique. Optical and laser properties of the active fibers with a phosphosilicate and aluminophosphosilicate glass cores doped with 1.85 mol% and 1.27 mol% Yb<sub>2</sub>O<sub>3</sub> were thoroughly investigated. With the help of hydrogen loading, it was possible to induce highly reflective Bragg grating in both fiber samples using the standard phase-mask technique and 193 nm-UV laser irradiation. The ultra-short (less than 2 cm long) Fabry–Perot laser cavities were fabricated by inscribing two fiber Bragg gratings (highly and partially reflective FBGs) directly in the core of the fiber samples. The highest pump-to-signal conversion efficiency of 47% was demonstrated in such laser configuration using phosphosilicate fiber. The reasons for the low efficiency of aluminophosphosilicate fiber are discussed.
ISSN:2079-6439