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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|
|Dates:||May 21-24, 2012|
|Keywords:||frequency standards,optical clocks|
|PDF version:||Click here to retrieve PDF version of paper (725KB)|