Improved short-term stability of optical frequency standards: approaching 1 Hz in 1 s with the Ca standard at 657 nm

2000 ◽  
Vol 25 (21) ◽  
pp. 1603 ◽  
Author(s):  
C. W. Oates ◽  
E. A. Curtis ◽  
L. Hollberg
Keyword(s):  
Optical Frequency ◽  
Short Term ◽  
Term Stability ◽  
Frequency Standards

Comparative short-term stability for a Cs beam and an expanding cold atomic cloud of Cs used as atomic frequency standards

Laser Physics ◽  
2006 ◽  
Vol 16 (8) ◽  
pp. 1268-1271 ◽  
Author(s):  
D. V. Magalhães ◽  
S. T. Müller ◽  
A. Bebeachibuli ◽  
R. F. Alves ◽  
V. S. Bagnato
Keyword(s):  
Atomic Cloud ◽  
Short Term ◽  
Term Stability ◽  
Frequency Standards ◽  
Atomic Frequency

Short-term stability of passive atomic frequency standards

1966 ◽  
Vol 54 (2) ◽  
pp. 170-176 ◽  
Author(s):  
R.F. Lacey ◽  
A.L. Helgesson ◽  
J.H. Holloway
Keyword(s):  
Short Term ◽  
Term Stability ◽  
Frequency Standards ◽  
Atomic Frequency

Progress towards optical frequency standards based on two-photon transitions in atomic silver

2004 ◽  
Author(s):  
Mark D. Plimmer ◽  
Thomas Badr ◽  
Stephane Guerandel ◽  
Yann Louyer ◽  
Sylvestre Challemel du Rozier ◽  
...  
Keyword(s):  
Optical Frequency ◽  
Two Photon ◽  
Frequency Standards ◽  
Atomic Silver

OPTICAL CLOCKS AND FREQUENCY METROLOGY FOR SPACE

2007 ◽  
Vol 16 (12b) ◽  
pp. 2537-2540
Author(s):  
HUGH KLEIN
Keyword(s):  
European Space Agency ◽  
Frequency Standard ◽  
Optical Frequency ◽  
Fundamental Physics ◽  
Frequency Standards ◽  
Space Agency ◽  
Primary Frequency ◽  
Measurement Capabilities ◽  
Science Activities ◽  
Frequency Metrology

Optical frequency standards and femtosecond comb measurement capabilities now rival and in some cases exceed those of microwave devices, with further improvements anticipated. Opportunities are emerging for the application of highly stable and accurate optical frequency devices to fundamental physics space science activities, and the European Space Agency (ESA) has recently commissioned studies on different aspects of optical clocks in space. This paper highlights some examples, including the difficulty of comparing very accurate terrestrial clocks at different locations due to fluctuations of the geoid; by locating a primary frequency standard in space, one could avoid geoid-related gravitational redshifts.

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