Brillouin scattering spectra in high-power single-frequency ytterbium doped fiber amplifiers.
TLDR
Experimental and theoretical investigations on spontaneous and stimulated Brillouin scattering during operation of a high-power single-frequency polarization-maintaining ytterbium doped fiber amplifier and their results have been compared with a theoretical model based on coupled intensity equations.Abstract:
We report on theoretical and experimental investigations on spontaneous and stimulated Brillouin scattering during operation of a high-power single-frequency polarization-maintaining ytterbium doped fiber amplifier. For different amplifier configurations with co- and counter-propagating seed and pump radiation the evolution of Brillouin scattering spectra was investigated with a heterodyne detection scheme. Spontaneous Brillouin gain spectra at low powers were additionally investigated using a pump-probe technique. The data obtained from these experiments have been compared with a theoretical model based on coupled intensity equations. A Brillouin scattering suppression has been investigated theoretically and experimentally with externally applied temperature gradients along the fiber resulting in up to 3.5 dB suppression and 115 W of amplifier output power.read more
Citations
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Materials for optical fiber lasers: A review
TL;DR: The relevance of the material in high power fiber laser technologies is reviewed, and where appropriate, materials-based paths to the enhancement of laser performance will be underscored.
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Increasing mode instability thresholds of fiber amplifiers by gain saturation
Arlee V. Smith,Jesse J. Smith +1 more
TL;DR: It is demonstrated that when suppression of stimulated Brillouin scattering and the population saturation effect are both taken into account, counter-pumped amplifiers have higher mode instability thresholds than co-pumping amplifiers for fully Yb3+ doped cores, and confined doping can further raise the thresholds.
Journal ArticleDOI
All-Fiber Counter-Propagation Pumped Single Frequency Amplifier Stage With 300-W Output Power
TL;DR: In this paper, a single frequency ytterbium-doped fiber amplifier, counter-propagation pumped with an all-fiber pump and signal combiner, is presented.
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Single-frequency fiber amplifier at 1.5 µm with 100 W in the linearly-polarized TEM 00 mode for next-generation gravitational wave detectors.
Omar de Varona,Willy Fittkau,Phillip Booker,Thomas Theeg,Michael Steinke,Dietmar Kracht,Jörg Neumann,Peter Wessels +7 more
TL;DR: This work presents a single-frequency monolithic Er:Yb co-doped fiber amplifier (EYDFA) at 1.5 µm with a linearly-polarized TEM00 output power of 100 W and performs numerical simulations to investigate the off-resonant pumping scheme and confirm the corresponding experimental results.
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High power, single-frequency, monolithic fiber amplifier for the next generation of gravitational wave detectors
Felix Wellmann,Michael Steinke,F. Meylahn,N. Bode,Benno Willke,Ludger Overmeyer,Jörg Neumann,Dietmar Kracht +7 more
TL;DR: A fiber amplifier engineering prototype with a pump power limited output power of 200 W demonstrated stable operation without beam quality degradation, and the measured relative pointing noise below 100 Hz and the higher order mode content is, to the best of the authors' knowledge, the lowest ever measured.
References
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