Cladding light handling in thulium-doped fiber amplifiers for kW-class spectral beam combination

Tilman Lühder; Yannik Atzbach; Denny Hoh; Tobias Koch; Friedrich Möller; Till Walbaum; Steffen Böhme; Thomas Schreiber

doi:10.1117/12.3022301

20 June 2024 Cladding light handling in thulium-doped fiber amplifiers for kW-class spectral beam combination

Tilman Lühder, Yannik Atzbach, Denny Hoh, Tobias Koch, Friedrich Möller, Till Walbaum, Steffen Böhme, Thomas Schreiber

Proceedings Volume 13003, Fiber Lasers and Glass Photonics: Materials through Applications IV; 130030L (2024) https://doi.org/10.1117/12.3022301
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Power scaling of fiber lasers has always been pursued, being limited by nonlinear effects and heat generation in the active fiber and various components. Among the most critical components are cladding light strippers (CLS) between amplifier chains, removing light from leaked higher order modes, the unabsorbed pump or losses from splices and components. Polymer-based CLS work sufficiently well for the near-IR including the pump wavelength at 793 nm but suffer from high absorption at the signal wavelength near 2 μm and have not been evaluated in detail in this regime. Therefore, it is necessary to examine different acrylates and siloxanes at both the pump and signal wavelengths individually concerning their performance as CLS and test their limits. We present a CLS with an improved design which can withstand 7.5 W at 2039 nm while stripping >46 dB. For higher powers to >800 W, we examine CO₂-laser inscribed CLS at the pump wavelength, reaching 21 dB stripping efficiency within only 15 mm of length.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Tilman Lühder, Yannik Atzbach, Denny Hoh, Tobias Koch, Friedrich Möller, Till Walbaum, Steffen Böhme, and Thomas Schreiber "Cladding light handling in thulium-doped fiber amplifiers for kW-class spectral beam combination", Proc. SPIE 13003, Fiber Lasers and Glass Photonics: Materials through Applications IV, 130030L (20 June 2024); https://doi.org/10.1117/12.3022301

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