Pump-probe differencing technique for cavity-enhanced, noise-canceling saturation laser spectroscopy.
We present an experimental technique that permits mechanical-noise-free, cavity-enhanced frequency measurements of an atomic transition and its hyperfine structure. We employ the 532-nm frequency-doubled output from a Nd:YAG laser and an iodine vapor cell. The cell is placed in a folded ring cavity (FRC) with counterpropagating pump and probe beams. The FRC is locked with the Pound-Drever-Hall technique. Mechanical noise is rejected by differencing the pump and probe signals. In addition, this differenced error signal provides a sensitive measure of differential nonlinearity within the FRC.
de Vine
Glenn
G
Centre for Gravitational Physics, Faculty of Science, The Australian National University, Canberra, ACT 0200, Australia. glenn.devine@anu.edu.au
McClelland
David E
DE
Gray
Malcolm B
MB
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John D
JD