A Radiation-Balanced Silica Fiber Amplifier

We report what we believe to be the first radiation-balanced fiber amplifier - a device that provides optical gain while experiencing no temperature rise. The gain medium is a silica fiber with a 21 um-diameter core highly doped with Yb3+ (2.52 wt.%) and co doped with 2.00 wt.% Al to reduce concentr...

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Published in:arXiv.org 2021-03
Main Authors: Knall, Jennifer M, Engholm, Magnus, Boilard, Tommy, Bernier, Martin, Digonnet, Michel J F
Format: Article
Language:English
Subjects:
Amplification
Amplifiers
Diameters
Fluorescence
Quenching
Radiation
Room temperature
Silicon dioxide
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creator Knall, Jennifer M
Engholm, Magnus
Boilard, Tommy
Bernier, Martin
Digonnet, Michel J F
description We report what we believe to be the first radiation-balanced fiber amplifier - a device that provides optical gain while experiencing no temperature rise. The gain medium is a silica fiber with a 21 um-diameter core highly doped with Yb3+ (2.52 wt.%) and co doped with 2.00 wt.% Al to reduce concentration quenching. The amplifier was core-pumped with 1040 nm light to create anti-Stokes fluorescence (ASF) cooling and gain in the core at 1064 nm. Using a custom slow-light FBG sensor with mK resolution, temperature measurements were performed at multiple locations along the amplifier fiber. A 4.35-m fiber pumped with 2.62 W produced 17 dB of gain while the average fiber temperature remained slightly below room temperature. This advancement is a fundamental step toward the creation of ultra-stable lasers necessary to many applications, especially low-noise sensing and high-precision metrology.
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subjects Amplification
Amplifiers
Diameters
Fluorescence
Quenching
Radiation
Room temperature
Silicon dioxide
title A Radiation-Balanced Silica Fiber Amplifier
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