Recent progress on monolithic fiber amplifiers for next generation of gravitational wave detectors

Felix Wellmann; Phillip Booker; Sven Hochheim; Thomas Theeg; Omar de Varona; Willy Fittkau; Ludger Overmeyer; Michael Steinke; Peter Weßels; Jörg Neumann; Dietmar Kracht

doi:10.1117/12.2289919

26 February 2018 Recent progress on monolithic fiber amplifiers for next generation of gravitational wave detectors

Felix Wellmann, Phillip Booker, Sven Hochheim, Thomas Theeg, Omar de Varona, Willy Fittkau, Ludger Overmeyer, Michael Steinke, Peter Weßels, Jörg Neumann, Dietmar Kracht

Author Affiliations +

Proceedings Volume 10512, Fiber Lasers XV: Technology and Systems; 105120I (2018) https://doi.org/10.1117/12.2289919
Event: SPIE LASE, 2018, San Francisco, California, United States

Abstract

Single-frequency fiber amplifiers in MOPA configuration operating at 1064 nm (Yb³⁺) and around 1550 nm (Er³⁺ or Er³⁺:Yb³⁺) are promising candidates to fulfill the challenging requirements of laser sources of the next generation of interferometric gravitational wave detectors (GWDs). Most probably, the next generation of GWDs is going to operate not only at 1064 nm but also at 1550 nm to cover a broader range of frequencies in which gravitational waves are detectable. We developed an engineering fiber amplifier prototype at 1064 nm emitting 215 W of linearly-polarized light in the TEM₀₀ mode. The system consists of three modules: the seed source, the pre-amplifier, and the main amplifier. The modular design ensures reliable long-term operation, decreases system complexity and simplifies repairing and maintenance procedures. It also allows for the future integration of upgraded fiber amplifier systems without excessive downtimes. We also developed and characterized a fiber amplifier prototype at around 1550 nm that emits 100 W of linearly-polarized light in the TEM₀₀ mode. This prototype uses an Er³⁺:Yb³⁺ codoped fiber that is pumped off-resonant at 940 nm. The off-resonant pumping scheme improves the Yb³⁺-to-Er³⁺ energy transfer and prevents excessive generation of Yb³⁺-ASE.

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Felix Wellmann, Phillip Booker, Sven Hochheim, Thomas Theeg, Omar de Varona, Willy Fittkau, Ludger Overmeyer, Michael Steinke, Peter Weßels, Jörg Neumann, and Dietmar Kracht "Recent progress on monolithic fiber amplifiers for next generation of gravitational wave detectors", Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120I (26 February 2018); https://doi.org/10.1117/12.2289919

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