Versatile Digital GHz Phase Lock for External Cavity Diode Lasers

Abstract

We present a versatile, inexpensive and simple optical phase lock for applications in atomic physics experiments. Thanks to all-digital phase detection and implementation of beat frequency pre-scaling, the apparatus requires no microwave-range reference input, and permits phase locking at frequency differences ranging from sub-MHz to 7 GHz (and with minor extension, to 12 GHz). The locking range thus covers ground state hyperfine splittings of all alkali metals, which makes this system a universal tool for many experiments on coherent interaction between light and atoms.

4.5 pages, 5 figures v3: fixed error in schematic: R10 connects to other end of C4

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• Quantum memory for squeezed light
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