Mitigation of transverse mode instability by heat load modulation in high-power fiber laser amplifiers
Kholaif S, Jauregui C, Tu Y, Limpert J (2022)
Publication Type: Conference contribution
Publication year: 2022
Journal
Publisher: SPIE
Book Volume: 11981
Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering
Event location: Virtual, Online
ISBN: 9781510648333
DOI: 10.1117/12.2609515
Abstract
Several studies have reported mitigation strategies of transverse mode instability. These are usually based either on reducing the strength of the thermally induced refractive index grating (RIG) and/or the modal interference pattern (MIP) along the fiber amplifier or on manipulating the phase shift between the RIG and the MIP. Here we report that a heat load modulation can be achieved by pulsing the seed and/or the pump in bursts, which induces a positive phase shift. In this way, a beam cleaning is achieved, which improves the performance of the amplifier system by allowing for operation with a diffraction-limited beam profile at an average output power significantly higher than the TMI threshold. The heat load modulation technique delivers a stable beam at an average output power higher than 1.5 times the TMI threshold with an instantaneous intra-burst power of around four times higher than the TMI threshold.
Involved external institutions
Germany (DE)How to cite
APA:
Kholaif, S., Jauregui, C., Tu, Y., & Limpert, J. (2022). Mitigation of transverse mode instability by heat load modulation in high-power fiber laser amplifiers. In Cesar Jauregui-Misas, V. R. Supradeepa (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. Virtual, Online: SPIE.
MLA:
Kholaif, Sobhy, et al. "Mitigation of transverse mode instability by heat load modulation in high-power fiber laser amplifiers." Proceedings of the Fiber Lasers XIX: Technology and Systems 2022, Virtual, Online Ed. Cesar Jauregui-Misas, V. R. Supradeepa, SPIE, 2022.
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