Doppler-free three-photon coherence effects in mercury vapor
Benjamin Rein, Jochen Schmitt, Martin R. Sturm, Reinhold Walser,, Thomas Walther

TL;DR
This paper reports the observation of Doppler-free three-photon coherence effects in mercury vapor and demonstrates the potential for laser amplification without inversion, supported by experimental and simulation results.
Contribution
It presents the first experimental observation of Doppler-free three-photon coherence effects in mercury vapor and explores the feasibility of inversionless lasing in this medium.
Findings
Doppler-free three-photon coherence effects observed at 253.7 nm
Simulations suggest amplification without inversion is feasible
Experimental results align with detailed theoretical models
Abstract
Doppler-free three-photon coherence effects at a wavelength of 253.7 nm have been observed in thermal mercury vapor. The experimental results are compared to simulations based on a detailed theoretical model reproducing the measured effects. Based on these results, we show by simulations that amplification without inversion in our setup is feasible, paving the way towards lasing without inversion in mercury.
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Taxonomy
TopicsLaser-Matter Interactions and Applications · Random lasers and scattering media · Quantum optics and atomic interactions
