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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.79: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

A pre-stabilized 1550 nm laser source for the ETpathfinder — •Nicole Knust, Fabian Meylahn, and Benno Willke — Leibniz Universität Hannover / Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Callinstr. 38, 30167 Hannover, Germany

The ETpathfinder is a new facility for testing technologies for the future third-generation gravitational wave observatory called Einstein Telescope. Three of the six interferometers of the Einstein Telescope are proposed to use silicon mirrors at a cryogenic temperature of about 10 K to reduce thermal noise. For compatibility with the new mirror material silicon, a shift to longer wavelengths than the currently used 1064 nm is required. The ETpathfinder will support the investigation of the potential of longer wavelengths in combination with silicon mirrors and the cryogenic cooling of an interferometer. Here we present the frequency and power stabilized laser source for the ETpathfinder with a wavelength of 1550 nm. In our design, the beam of a low-noise, low-power external cavity diode laser is amplified to 10 W output power in two stages. To reduce the beam pointing and higher order mode content, the beam is filtered by an optical cavity. Active, multiple path, and high-bandwidth laser power and frequency stabilizations are implemented to achieve the laser stability needed for use in gravitational wave detectors.