Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers

Moller F, Distler V, Schreiber T, Eberhardt R, Tunnermann A (2020)

Publication Type: Conference contribution

Publication year: 2020

Journal

Proceedings of SPIE Society of Photo-optical Instrumentation Engineers (SPIE)

Publisher: SPIE

Book Volume: 11260

Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering

Event location: San Francisco, CA, USA

ISBN: 9781510632837

DOI: 10.1117/12.2545951

Abstract

Supported by both experimental and simulated results, this contribution demonstrates the heat load distribution in a co-pumped, ytterbium (Yb)-doped fiber amplifier seeded with two different wavelengths can be significantly changed depending on the seed power ratio. Longitudinal temperature measurements in a Yb-doped 10.5 m 20/400 μm fiber confirm a significant shift of the heat load maximum by 3.5 m towards the fiber output when decreasing the seed power ratio from P1030nm/P1080nm = 1.7 to 20. In single-tone operation with a seed power of P1080nm = 3.5 W, the amplifier is limited by the onset of transverse mode instabilities at a power-level of 1950 W. However, dual-tone seeding with a seed power ratio up to P1030nm/P1080nm = 10 reduces the TMI-threshold dramatically down to 1050 W. Additionally we show, that the modal instability threshold is very susceptible to 1030 nm seed noise in the frequency regime up to 10 kHz.

Involved external institutions

Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering

Germany (DE)

How to cite

APA:

Moller, F., Distler, V., Schreiber, T., Eberhardt, R., & Tunnermann, A. (2020). Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers. In Liang Dong (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. San Francisco, CA, USA: SPIE.

MLA:

Moller, Friedrich, et al. "Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers." Proceedings of the Fiber Lasers XVII: Technology and Systems 2020, San Francisco, CA, USA Ed. Liang Dong, SPIE, 2020.

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