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|Title:||Operating atomic fountain clock using robust DBR laser: short-term stability analysis|
|Citation:||IEEE Transactions on Instrumentation and Measurement, 2017; 66(6):1349-1354|
|Sangmin Lee, Myoung-Sun Heo, Taeg Yong Kwon, Hyun-Gue Hong, Sang-Bum Lee, Ashby Paul Hilton, Andre Nicholas Luiten, John Gideon Hartnett, and Sang Eon Park|
|Abstract:||We report on a robust distributed Bragg reflector (DBR) laser system for an atomic fountain clock. To confirm the performance of a DBR laser, the short-term stability of an atomic fountain clock, KRISS-F1, is measured with both DBR laser and an extended-cavity diode laser (ECDL) as a master laser in the fountain laser system. The short-term stability of the fountain clock due to the laser noise is determined to be σy(τ = Tc) = 1.4×10−14 when either the ECDL or the DBR laser is used as a master laser. The total stability of the fountain clock with the DBR laser is limited to 3.5× 10−14 at 1 s of averaging time and at the highest atom number in the experiment, which is limited by quantum projection noise. No additional degradation in fountain performance is observed when an ECDL is replaced by the DBR laser. From these results, we conclude that our fountain clock is made much more robust by adopting a DBR laser, which is immune to acoustic and vibrational shocks as well as environmental temperature variations.|
|Keywords:||Cesium; distributed Bragg reflector (DBR) laser; extended-cavity diode laser (ECDL); fountain clock; primary frequency standard; quantum projection noise|
|Description:||Date of Publication: 02 January 2017|
|Rights:||© 2017 IEEE|
|Appears in Collections:||IPAS publications|
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