Title :
An analysis of major frequency shifts in the LPTF optically pumped primary frequency standard
Author :
Rovera, Giovanni Daniele ; De Clercq, Emeric ; Clairon, André
Author_Institution :
Lab. Primaire du Temps et des Frequences, BNM-Obs. de Paris, France
fDate :
3/1/1994 12:00:00 AM
Abstract :
An analysis of the major frequency shifts of our optically pumped cesium beam primary frequency standard is presented, together with a description of the most relevant characteristics of the device. The short term frequency stability was measured against a hydrogen maser. The square root of the Allan variance (/spl sigma//sub y/(/spl tau/) is at present 5.8.10/sup /spl minus/13//spl tau//sup /spl minus/1/2/, with a flicker level at 3.3.10/sup /spl minus/15/. This extremely good frequency stability enables a highly precise analysis of the most important systematic frequency shifts to be performed in a short time. Our first accuracy evaluation results in an uncertainty (1/spl sigma/) of 1.1.10/sup /spl minus/13/.<>
Keywords :
atomic clocks; caesium; frequency measurement; frequency stability; measurement standards; optical pumping; Allan variance; Cs; Cs beam; LPTF; flicker level; frequency shifts; optically pumped atomic beam; primary frequency standard; short term frequency stability; Frequency measurement; Hydrogen; Laser excitation; Masers; Optical beams; Optical devices; Optical pumping; Performance analysis; Stability analysis; Uncertainty;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
