High-power single-frequency depressed-cladding, confined-doping Yb3+ fiber amplifier

Kristopher Kruska; Phillip Booker; Peter Weßels; Jörg Neumann; Dietmar Kracht

doi:10.1117/12.3001458

12 March 2024 High-power single-frequency depressed-cladding, confined-doping Yb³⁺ fiber amplifier

Kristopher Kruska, Phillip Booker, Peter Weßels, Jörg Neumann, Dietmar Kracht

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 1286513 (2024) https://doi.org/10.1117/12.3001458
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

The output power of single-frequency fiber amplifiers is usually limited by nonlinear effects such as stimulated Brillouin scattering (SBS). To obtain higher power thresholds for the onset of unwanted nonlinear effects, the mode area of the fibers in use needs to be increased. Specialty fibers can provide larger mode areas and thus push the current power limits of single-frequency fiber amplifiers while maintaining single-mode beam quality as required by next generation gravitational wave detectors. Fibers with a large core diameter, depressed cladding around the core and a confined doping (DCCD-fiber) inside the core are by now commercially available and address the need for large mode area fibers while maintaining single-mode operation. The depressed cladding leads to a smaller effective refractive index difference for Higher Order Modes (HOM) in comparison to the fundamental mode which results in a significant increase of bending losses for the HOM. The confined doping results in a selective gain increase for the fundamental mode. Here, we present a forward pumped single-frequency amplifier based on an Yb³⁺-doped DCCD fiber. With this fiber, an output power of 400W was achieved with a slope efficiency of 75%, and a PER of 15 dB. The amplifier showed no signs of SBS or parasitic lasing of the amplified spontaneous emission. This work will evaluate the potential of the used DCCD fiber in the context of next generation gravitational wave detector lasers.

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

Citation Download Citation

Kristopher Kruska, Phillip Booker, Peter Weßels, Jörg Neumann, and Dietmar Kracht "High-power single-frequency depressed-cladding, confined-doping Yb³⁺ fiber amplifier", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 1286513 (12 March 2024); https://doi.org/10.1117/12.3001458

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KEYWORDS

Fiber amplifiers

Doping

Laser frequency

Oscillators

Ytterbium

Solid state lasers

Specialty optical fibers

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