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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum Gases II

Q 57.10: Poster

Donnerstag, 17. März 2022, 16:30–18:30, P

Modulation Transfer Spectroscopy in Atomic Lithium-6 — •Leo Walz, Tobias Hammel, Maximilian Kaiser, Selim Jochim, and Matthias Weidenmüller — Physikalisches Institut, Heidelberg, Germany

Good experimental control and imaging of ultracold quantum gasses is in many parts achieved through precisely tuned laser pulses, often with a frequency specifically detuned to an atomic transition or directly on resonance. This requires active frequency stabilization of the laser system.

This poster shows the implementation of a modulation transfer spectroscopy setup to exploit the strong dispersive property of atomic transitions on modulated laserlight within the Doppler-free saturation regime. Modulation transfer through degenerate four-wave mixing leads to a zero baseline error signal with a steep signal slope at the zero crossing, that is centered on the atomic transition. Further optimization guided by theory from [1] leads to a fast and high fidelity error signal well suitable for external laser locking. With this setup, frequency deviations on a scale of 1/10th to the natural linewidth are resolvable. In this regime, the leading contribution to frequency noise comes from pressure fluctuations through acoustic noise in the lab.

[1] Tilman Preuschoff, Malte Schlosser, and Gerhard Birkl Opt. Express 26, 24010-24019 (2018)