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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | A robust phase-locked diode laser system for EIT experiments in Cesium

David Höckel, Matthias Scholz, and Oliver Benson (2009)

A robust phase-locked diode laser system for EIT experiments in Cesium

Applied Physics B, 94:429.

We describe a phase-locked diode laser system specifically designed for experiments that require two stable frequency-offset locked wavelengths, here used to prepare coherence in atomic media. The system consists of two external-cavity diode lasers that are phase-locked using an ultra-low phase-noise digital-only phase detector and appropriate loop filters. The residual phase-noise variance σ φ 2 was measured to be less than 0.02 rad2. The system was used to demonstrate electromagnetically induced transparency (EIT) in Cs reaching a transmission of >60% for a transparency window width of 1.1 MHz. We present a theoretical description of the measured transmission curves relying on the dephasing rate as the only free parameter.