Title :
Velocity distribution and second-order Doppler shift in an optically pumped cesium beam frequency standard
Author :
Lee, Ho Seong ; Baek, Kwang Jae ; Kwon, Taeg Yong ; Yang, Sung Hoon
Author_Institution :
Div. of Electromagn. Metrol., Korea Res. Inst. of Stand. & Sci., Taejon, South Korea
fDate :
4/1/1999 12:00:00 AM
Abstract :
The velocity distribution and the second-order Doppler shift were obtained in an optically pumped cesium beam frequency standard at the Korea Research Institute of Standards and Science (KRISS) by using Fourier transforms of Ramsey lineshapes. The second-order Doppler shift changes as much as 3×10-15 for a variation 20 K at an oven temperature of 383 K. It also changes at a rate of -2.3×10 -14/dB around an optimum microwave power. We found that the velocity selective effect of a tilted laser beam can reduce the second-order Doppler shift. In particular, this effect becomes larger as the linewidth of the laser beam becomes narrower
Keywords :
Doppler shift; Fourier transform optics; atomic beams; atomic clocks; frequency stability; frequency standards; optical pumping; 383 K; Cs; Fourier transforms; Ramsey lineshapes; cesium beam frequency standard; frequency stability; optically pumped; optimum microwave power; oven temperature; second-order Doppler shift; tilted laser beam; velocity distribution; velocity selective effect; Doppler shift; Fourier transforms; Frequency; Laser beams; Laser excitation; Masers; Optical beams; Optical pumping; Ovens; Temperature;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
