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We have quantified a short term instability budget for an optical frequencystandard based on cold, freely expanding calcium atoms. Such systems are thesubject of renewed interest due to their high frequency stability and relativetechnical simplicity compared to trapped atom optical clocks. By filtering theclock laser light at 657 nm through a high finesse cavity, we observe a slightreduction in the optical Dick effect caused by aliased local oscillator noise.The ultimately limiting technical noise is measured using a technique that doesnot rely on a second clock or fs-comb.

Stability limits of an optical frequency standard based on free Ca atoms