A high stability optical frequency reference based on thermal calcium atoms
MASSACHUSETTS INST OF TECH CAMBRIDGE
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Here we report an imprecision below 10-14 with a simple, compact optical frequency standard based upon thermal calcium atoms. Using a Ramsey-Bord spectrometer we excite features with linewidths less than 5 kHz for the 1S0-3P1 intercombination line at 657 nm. We have measured a fractional frequency instability below 6 x 10-15 at 1 s, with good prospects for still quieter performance. The key remaining issue for this standard is how well first- and secondorder Doppler drifts can be suppressed. Due to its experimental simplicity such a system could find application as a less accurate, but high stability reference for commercial applications.
- Electricity and Magnetism
- Atomic and Molecular Physics and Spectroscopy