Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>

We report on a single-frequency fiber master oscillator power amplifier utilizing a polarization-maintaining step-index fiber with an Al/Ce/F core-glass composition doped with a very high Yb concentration (0.25 at.%). This design made it possible to use a very short fiber (~1 m) and to coil it in a...

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Autores principales:	Enkeleda Balliu, Magnus Engholm, Michel J. F. Digonnet, Riaan S. Coetzee, Gunnar Elgcrona, Hans-Erik Nilsson
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Yb-doped fibers single frequency fiber amplifier photodarkening compact fiber amplifier Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/737b015c88434908b42662823f9ace1d
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spelling	oai:doaj.org-article:737b015c88434908b42662823f9ace1d2021-11-11T15:02:57ZCompact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>10.3390/app112199512076-3417https://doaj.org/article/737b015c88434908b42662823f9ace1d2021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9951https://doaj.org/toc/2076-3417We report on a single-frequency fiber master oscillator power amplifier utilizing a polarization-maintaining step-index fiber with an Al/Ce/F core-glass composition doped with a very high Yb concentration (0.25 at.%). This design made it possible to use a very short fiber (~1 m) and to coil it in a tight radius (4 cm in the amplifier, while 2 cm gave similarly negligible bending loss) so that the packaged system is one of the most compact reported to date (~0.6 L). The use of a short fiber increased the threshold for stimulated Brillouin scattering well above 100 W while maintaining near-ideal beam quality. The fiber was pumped with a diode-pumped solid-state laser and cooled passively by spooling it on a grooved aluminum mandrel. The amplifier produced a strongly linearly polarized output at 1064 nm in the fundamental mode (<i>M<sup>2</sup></i> ≤ 1.2) with a 150 kHz linewidth and a power of 81.5 W for 107 W of launched pump power. No deleterious effects from the elevated thermal load were observed. The residual photodarkening loss resulting from the high Yb concentration, found to be small (~0.7 dB/m inferred at 1064 nm) with accelerated aging, reduced the output power by only ~20% after 150 h of operation.Enkeleda BalliuMagnus EngholmMichel J. F. DigonnetRiaan S. CoetzeeGunnar ElgcronaHans-Erik NilssonMDPI AGarticleYb-doped fiberssingle frequencyfiber amplifierphotodarkeningcompact fiber amplifierTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9951, p 9951 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Yb-doped fibers single frequency fiber amplifier photodarkening compact fiber amplifier Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	Yb-doped fibers single frequency fiber amplifier photodarkening compact fiber amplifier Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Enkeleda Balliu Magnus Engholm Michel J. F. Digonnet Riaan S. Coetzee Gunnar Elgcrona Hans-Erik Nilsson Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>
description	We report on a single-frequency fiber master oscillator power amplifier utilizing a polarization-maintaining step-index fiber with an Al/Ce/F core-glass composition doped with a very high Yb concentration (0.25 at.%). This design made it possible to use a very short fiber (~1 m) and to coil it in a tight radius (4 cm in the amplifier, while 2 cm gave similarly negligible bending loss) so that the packaged system is one of the most compact reported to date (~0.6 L). The use of a short fiber increased the threshold for stimulated Brillouin scattering well above 100 W while maintaining near-ideal beam quality. The fiber was pumped with a diode-pumped solid-state laser and cooled passively by spooling it on a grooved aluminum mandrel. The amplifier produced a strongly linearly polarized output at 1064 nm in the fundamental mode (<i>M<sup>2</sup></i> ≤ 1.2) with a 150 kHz linewidth and a power of 81.5 W for 107 W of launched pump power. No deleterious effects from the elevated thermal load were observed. The residual photodarkening loss resulting from the high Yb concentration, found to be small (~0.7 dB/m inferred at 1064 nm) with accelerated aging, reduced the output power by only ~20% after 150 h of operation.
format	article
author	Enkeleda Balliu Magnus Engholm Michel J. F. Digonnet Riaan S. Coetzee Gunnar Elgcrona Hans-Erik Nilsson
author_facet	Enkeleda Balliu Magnus Engholm Michel J. F. Digonnet Riaan S. Coetzee Gunnar Elgcrona Hans-Erik Nilsson
author_sort	Enkeleda Balliu
title	Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>
title_short	Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>
title_full	Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>
title_fullStr	Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>
title_full_unstemmed	Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>
title_sort	compact single-frequency mopa using a silica fiber highly doped with yb<sup>3+</sup>
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/737b015c88434908b42662823f9ace1d
work_keys_str_mv	AT enkeledaballiu compactsinglefrequencymopausingasilicafiberhighlydopedwithybsup3sup AT magnusengholm compactsinglefrequencymopausingasilicafiberhighlydopedwithybsup3sup AT micheljfdigonnet compactsinglefrequencymopausingasilicafiberhighlydopedwithybsup3sup AT riaanscoetzee compactsinglefrequencymopausingasilicafiberhighlydopedwithybsup3sup AT gunnarelgcrona compactsinglefrequencymopausingasilicafiberhighlydopedwithybsup3sup AT hanseriknilsson compactsinglefrequencymopausingasilicafiberhighlydopedwithybsup3sup
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Compact Single-Frequency MOPA Using a Silica Fiber Highly Doped with Yb<sup>3+</sup>

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