Phase-locked laser system for use in atomic coherence experiments
Alberto M. Marino, C. R. Stroud
Review of Scientific Instruments 79, 013104 (2008).
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We describe a phase-coherent laser system designed for use in experiments involving coherently
prepared atomic media. We implement a simple technique based on a sample-and-hold circuit
together with a reset of the integrating electronics that makes it possible to scan continuously the
relative frequency between the lasers of over tens of gigahertz while keeping them phase locked.
The system consists of three external-cavity diode lasers operating around 795 nm. A low-power
laser serves as a frequency reference for two high-power lasers which are phased locked with an
optical phase-locked loop. We measured the residual phase noise of the system to be less than
0.04 rad2. In order to show the application of the system towards atomic coherence experiments, we
used it to implement electromagnetically induced transparency in a rubidium vapor cell and
obtained a reduction in the absorption coefficient of 92%.
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