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Q: Fachverband Quantenoptik und Photonik

Q 42: Poster III

Q 42.4: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

An Experimental Setup to Study Amplification Without Inversion in Mercury — •Daniel Preißler and Thomas Walther — TU Darmstadt, Institute for Applied Physics, Laser and Quantum Optics, Schlossgartenstr. 7, D-64289 Darmstadt

For conventional laser sources, the required power to achieve the necessary population inversion scales with at least the fourth power of the laser frequency. This severaly limits the generation of lasers at short ultraviolet wavelengths and below. To overcome this problem, the coherent reabsorption can be suppressed by carefully employing atomic coherence effects. This is called lasing without inversion (LWI).

In a recent publication Rein et al. (Phys Rev. A 105 (2022) 023722) showed an experimental setup to study an LWI scheme in atomic mercury vapor, consisting out of two driving lasers at 435.8nm and 546.1nm, a repumper at 404.7nm and a probe system which doubles as a pump source at 253.7nm. This allowed for the further refinement of a theoretical model and its comparison with experimental data.

Based on this model, critical parameters towards achieving amplification withouth inversion (AWI) - a prerequisite for LWI - could be identified through simulations. This includes the power and spectral width of the pump system and the power of the strong driving field at 435.8nm.

In this contribution the results of those simulations as well as the experimental steps taken to improve on those parameters will be presented. Additionally, measurements of the observed three photon coherence effect will be discussed.