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Publication Citation: A high stability optical frequency reference based on thermal calcium atoms

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Author(s): Richard W. Fox; Jeffrey A. Sherman; W. Douglas; Judith B. Olson; Andrew D. Ludlow; Christopher W. Oates;
Title: A high stability optical frequency reference based on thermal calcium atoms
Published: May 24, 2012
Abstract: Here we report an imprecision below 10-14 with a simple, compact optical frequency standard based upon thermal calcium atoms. Using a Ramsey-Borde spectrometer we excite features with linewidths < 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 is for this standard is how well first- and second-order Doppler drifts can be suppressed. Due to its experimental simplicity such a system could find application as a high stability reference for commercial applications.
Conference: 2012 IEEE Frequency Control Symposium
Proceedings: Proceedings of 2012 IEEE Frequency Control Symposium
Pages: pp. 1 - 3
Location: Baltimore, MD
Dates: May 21-24, 2012
Keywords: frequency standards;optical clocks
Research Areas: Physics