Erlangen 2022 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 1: Laser Systems

K 1.6: Vortrag

Dienstag, 15. März 2022, 11:45–12:00, K-H4

Laser frequency stabilization using quasi-monolithic unequal-arm interferometers — •Miguel Dovale Alvarez, Victor Huarcaya, Moritz Mehmet, Juan Jose Esteban Delgado, and Gerhard Heinzel — Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Callinstrasse 38, 30167 Hannover, Germany

Lasers with high and ultra-high frequency stability are a key resource in many areas of science and technology, such as high-precision time and frequency metrology, inertial sensing, and the search for gravitational waves. Typically the required stability is achieved by locking the laser to the narrow resonance of a structurally stable optical cavity, or to the narrow absolute reference frequency provided by atomic or molecular transitions. These frequency stabilization schemes usually involve many optical components, modulators, and complex electronics. Here we describe the advances in laser frequency stabilization via quasi-monolithic unequal-arm interferometers with DC balanced readout. In this scheme the setup consists of only a handful of optical components, as well as an analog circuit to perform the balanced readout and the feedback to the laser. The structural stability of the interferometer is transferred to the frequency stability of the laser, and hence a big effort is directed towards isolating the interferometer from external perturbations. Preliminary measurements show a stability of 100 Hz/√Hz at 1 Hz, worsening with 1/f at lower frequencies. In the next iteration of this experiment, we aim to reduce the noise floor at low frequency by enhancing several aspects of the setup. ± 1^∘