Highly efficient, in-band pumped, thulium-doped, Q-switched fiber laser

Mathias Lenski; Tobias Heuermann; Ziyao Wang; Christopher Aleshire; Christian Gaida; César Jáuregui; Jens Limpert

doi:10.1117/12.3002765

12 March 2024 Highly efficient, in-band pumped, thulium-doped, Q-switched fiber laser

Mathias Lenski, Tobias Heuermann, Ziyao Wang, Christopher Aleshire, Christian Gaida, César Jáuregui, Jens Limpert

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 128650T (2024) https://doi.org/10.1117/12.3002765
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

High power laser sources in the 2 μm wavelength region and emitting ns-pulses have many applications in material processing, biology as well as for laser plasma sources targeting the extreme ultraviolet region. Thulium (Tm)-doped fibers represent a very attractive platform for Q-switched systems emitting ns pulses in the 2 μm wavelength range. Usually, high-power, Tm-doped fiber amplifiers are pumped at 790 nm. By exploiting Cross-Relaxations (CR) the slope efficiency can be significantly increased beyond the Stokes limit. However, in those fiber systems targeting mJ pulse energy, the slope efficiency is barely above 35 %. Due to the large quantum defect of approximately 60 % such systems face considerable thermal challenges. In this contribution an in-band pumped Q-switched oscillator is demonstrated. This source is used to seed an in-band pumped, Tm-doped, rod-type amplifier which delivers up to 6.1 mJ pulse energy and up to 128 W average power with 77% slope efficiency.

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

Citation Download Citation

Mathias Lenski, Tobias Heuermann, Ziyao Wang, Christopher Aleshire, Christian Gaida, César Jáuregui, and Jens Limpert "Highly efficient, in-band pumped, thulium-doped, Q-switched fiber laser", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 128650T (12 March 2024); https://doi.org/10.1117/12.3002765

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