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Quantum-limited measurements of intensity noise levels in Yb-doped fiber amplifiers

 
: Popp, A.; Distler, V.; Jaksch, K.; Sedlmeir, F.; Müller, C.R.; Haarlammert, N.; Schreiber, T.; Marquardt, C.; Tünnermann, A.; Leuchs, G.

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Fulltext ()

Applied Physics. B 126 (2020), No.8, Art. 130, 7 pp.
ISSN: 0340-3793
ISSN: 0721-7269
ISSN: 0946-2171
ISSN: 1432-0649
English
Journal Article, Electronic Publication
Fraunhofer IOF ()
fiber amplifier; Ytterbium; beam quality; quantum noise; shot noise

Abstract
We investigate the frequency-resolved intensity noise spectrum of an Yb-doped fiber amplifier down to the fundamental limit of quantum noise. We focus on the kHz and low MHz frequency regime with special interest in the region between 1 and 10 kHz. Intensity noise levels up to ≥ 60 dB above the shot noise limit are found, revealing great optimization potential. Additionally, two seed lasers with different noise characteristics were amplified, showing that the seed source has a significant impact and should be considered in the design of high power fiber amplifiers.

: http://publica.fraunhofer.de/documents/N-596860.html