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Compact single-freq...
Compact single-frequency mopa using a silica fiber highly doped with yb3+
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- Balliu, Enkeleda, PhD student (author)
- Mittuniversitetet,Institutionen för elektronikkonstruktion
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- Engholm, Magnus (author)
- Mittuniversitetet,Institutionen för elektronikkonstruktion
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Digonnet, Michel J. F. (author)
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Coetzee, Riaan. S. (author)
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Elgcrona, Gunnar (author)
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- Nilsson, Hans-Erik, 1965- (author)
- Mittuniversitetet,Institutionen för elektronikkonstruktion
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(creator_code:org_t)
- 2021-10-25
- 2021
- English.
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In: Applied Sciences. - : MDPI AG. - 2076-3417. ; 11:21
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https://doi.org/10.3...
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https://miun.diva-po... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Subject headings
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- 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 (M2 ≤ 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Compact fiber amplifier
- Fiber amplifier
- Photodarkening
- Single frequency
- Yb-doped fibers
Publication and Content Type
- ref (subject category)
- art (subject category)
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