Laser Induced Asymmetry and Inhomogeneous Broadening of the Microwave Line Shape of a Gas Cell Atomic Frequency Standard

J.C. Camparo, R.P. Frueholz, C.H. Volk

Abstract:	Recently, there has been interest in the possibility of replacing the rf discharge lamp in a rubidium gas cell clock with a single mode laser diode. Since the short term stability of the rubidium frequency standard is limited by the shot noise of the photodetector, an increased signal-to-noise ratio due to more efficient laser diode optical pumping might improve the short term performance. Because the emission wavelength of the laser diode can be tuned, improved long term performance could be gained through the control of the light shift effect. However, due to the nature of the gas cell frequency standard, various physical phenomena are strongly coupled in their effect on the frequency output, and thus careful consideration must be given to any change in one parameter because of its interrelation with other We report here some investigations concerning the coupled effect of the optical and microwave fields in the rubidium atomic clock. We show that this type of coupling is an important consideration for any attempt to incorporate & laser diode into a gas cell clock.
Published in:	Proceedings of the 14th Annual Precise Time and Time Interval Systems and Applications Meeting November 30 - 3, 1982 NASA Goddard Space Flight Center Greenbelt, Maryland
Pages:	113 - 131
Cite this article:	Camparo, J.C., Frueholz, R.P., Volk, C.H., "Laser Induced Asymmetry and Inhomogeneous Broadening of the Microwave Line Shape of a Gas Cell Atomic Frequency Standard," Proceedings of the 14th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1982, pp. 113-131.
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