An optical beam frequency reference with 10-14 range frequency instability

McFerran, J. J.; Hartnett, J. G.; Luiten, A. N.
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p031103
Academic Journal
The authors report on a thermal beam optical frequency reference with a fractional frequency instability of 9.2×10-14 at 1 s reducing to 2.0×10-14 at 64 s before slowly rising. The 1S0↔3P1 intercombination line in neutral 40Ca is used as a frequency discriminator. A diode laser at 423 nm probes the ground state population after a Ramsey–Bordé sequence of 657 nm light-field interactions on the atoms. The measured fractional frequency instability is an order of magnitude improvement on previously reported thermal beam optical clocks. The photon shot-noise of the read-out produces a limiting square root Λ-variance of 7×10-14/τ.


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