Passive atomic frequency standard based on coherent population trapping in {sup 87}Rb using injection-locked lasers
- Department of Physics, National University, 30 Jangjun-Dong, Geumjeong-Gu, Busan 609-735 (Korea, Republic of)
We present a microwave frequency standard based on coherent population trapping (CPT) in the {sup 87}Rb D{sub 1} line. The CPT spectrum is obtained using two Raman lasers with a 6.8 GHz frequency offset by injection locking of a master laser to a slave laser. We have constructed an atomic clock employing a 5 cm long Rb vapor cell confined with 6.67 kPa neon buffer gas at 70 degree sign C. Using this system, we improve the CPT contrast through the elimination of undesired off-resonant fields created by the direct modulation method. We measured the frequency shift of the CPT signal as a function of the temperature of the Rb cell and estimated it to be approximately 1.3x10{sup -9}/K. The frequency of a 10 MHz crystal oscillator has been stabilized to the CPT spectrum between the two ground states in {sup 87}Rb. The relative frequency stability is approximately 2.3x10{sup -12} for an average time of 68 s.
- OSTI ID:
- 20861067
- Journal Information:
- Journal of the Optical Society of America. Part B, Optical Physics, Vol. 23, Issue 11; Other Information: DOI: 10.1364/JOSAB.23.002393; (c) 2006 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0740-3224
- Country of Publication:
- United States
- Language:
- English
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