Title :
Frequency locking of laser diodes using an optically pumped cesium beam tube [frequency standard]
Author :
Hisadome, Kenji ; Kihara, Masami
Author_Institution :
NTT Transmission Syst. Lab. Kanagawa, Japan
Abstract :
An optically pumped cesium beam tube is described. This tube is 680 mm long, and has two cesium beam ovens and four atom-laser interaction zones. The frequency of a laser diode is locked to the fluorescence from the cesium beam. The frequency fluctuation of this frequency-locked laser diode and the short-term frequency stability of the optically pumped cesium beam frequency standard using this laser diode are theoretically estimated according to the measured beam current values. The directivity of the cesium beam tube is measured to determine the proper operational condition. When oven temperature is 130°C, a practical lifetime of about 4 years (1 g Cs metal enclosed) and a good short-term frequency stability are shown
Keywords :
atomic beams; atomic clocks; atomic photoexcitation; caesium; frequency measurement; frequency stability; laser beam applications; laser mode locking; lasers; measurement standards; optical pumping; semiconductor junction lasers; 130 degC; 680 mm; Cs; atom-laser interaction zones; atomic beam tube; directivity; fluorescence; frequency fluctuation; frequency locking; frequency standard; laser diodes; laser frequency stability; optical pumping; ovens; short-term frequency stability; Atom optics; Atomic beams; Atomic measurements; Diode lasers; Frequency estimation; Laser beams; Laser excitation; Optical beams; Optical pumping; Ovens;
Conference_Titel :
Frequency Control, 1990., Proceedings of the 44th Annual Symposium on
Conference_Location :
Baltimore, MD
DOI :
10.1109/FREQ.1990.177478
