Karl Franzens University Graz

Graz University of Technology 

Advances in Broadband Saturation Spectroscopy: Towards Probing New Physics in the Mid-Infrared
Prof. Oliver Heckl
Fakultätszentrum für Nanostrukturforschung, Universität Wien
16:15 - 17:15 Tuesday 25 November 2025 TUG HS P2

Broadband precision spectroscopy of rovibrational transitions holds promise for tracking periodic variations in fundamental constants. Such variations may offer evidence supporting the existence of ultralight dark matter and indicate new physics. This seminar provides an overview of our efforts in achieving broadband saturation spectroscopy in the mid-infrared. Our focus lies on crystalline super mirrors, featuring a cavity finesse surpassing 400,000, and low-noise high-power frequency combs generating Watt-level output power.