Analytic modeling of Brillouin gain in rare-earth doped fiber amplifiers with high-power single-frequency signals

Kovalev, V. F.; Harrison, Robert G.; Nilsson, Johan; Jeong, Yoonchan; Hernandes-Solis, V.; Sahu, J.K.

doi:10.1117/12.591913

Cited by 1 publication

(2 citation statements)

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“…The Brillouin frequency shift depends on the temperature, so with a varying temperature, the Brillouin gain peak wavelength shifts along the fiber. This Brillouin gain broadening [19], [20] have verified the effect theoretically. Configurations with external temperature control of different segments of the gain fiber have also been used for further experimental investigations of the effect [21].…”

Section: Introductionsupporting

confidence: 49%

“…We presume this SBS-free operation was due mainly to the Brillouin gain broadening introduced by the longitudinal temperature gradient along the amplifier fiber. This has also been expected in the theoretical analyses in Refs [19] and [20]. However, experimentally, it remains unclear of what SBS-free power level this fiber could be reached with higher pump power.…”

Section: Experimental Results: 402 W Pm Ydf and 511 W Non-pm Ydfmentioning

confidence: 63%

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Power Scaling of Single-Frequency Ytterbium-Doped Fiber Master-Oscillator Power-Amplifier Sources up to 500 W

Jeong

Nilsson

Sahu

et al. 2007

IEEE J. Select. Topics Quantum Electron.

238

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We discuss continuous-wave single-frequency master oscillator -power amplifier (MOPA) sources based on ytterbium-doped fibers (YDFs) with particular attention to their recent dramatic advances and our up-to-date experimental results. This includes a 402 W planepolarized MOPA source and a 511 W random-polarized MOPA source. In these MOPAs, the final-stage high-power amplifier could operate with high efficiency of 70% -80% and even more, and a high gain of over 20 dB in a near diffraction-limited beam. We could see at least 7 dB enhancement of the stimulated Brillouin scattering (SBS) threshold for the 402 W polarization-maintaining (PM) YDF. In fact, we did not see any sign of SBS even at the highest output power. We eventually observed SBS appearance at around 500 W for the non-PM YDF. The observed SBS strengths were far weaker than expected in theory unless we allowed for the Brillouin gain reduction from thermal Brillouin gain broadening induced by the quantum-defect heating.

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Section: Introductionsupporting

confidence: 49%

Section: Experimental Results: 402 W Pm Ydf and 511 W Non-pm Ydfmentioning

confidence: 63%