Abstract
In the presently prevailing CPT atomic clock the CPT state is prepared with either a pure left (or right) circularly polarized light, which pumps certain atoms into spin-polarized dark states thus degrading the quality of the CPT signal. The contrast (the CPT signal intensity divided by the background intensity) is normally only 4 % with this scheme. The paper presents our recently developed scheme in which laser beam is twice utilized by means of polarization reflection and the so obtained coaxial left and right circularly polarized lights simultaneously resonate with atoms, which eliminates spin-polarized dark state and stronger CPT resonance can be achieved with resonance interference enhancement. The contrast higher than 12 % of CPT signal has been obtained and the experimental result also reveals that the scheme especially suits for achieving atomic clock with good long-term behavior. Moreover, our scheme is suitable for integration, which makes it a promising candidate for both small-size and chip-scale CPT atomic clock.
Keywords
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Vanier J, Godone A, Levi F, Micalizio S (2003) Atomic clocks based on coherent population trapping: basic theoretical models and frequency stability. In: Frequency control symposium and PDA exhibition jointly with the 17th European frequency and time forum
Vanier J, Levine MW, Janssen D, Delaney M (2003) Contrast and linewidth of the coherent population trapping transmission hyperfine resonance line in 87Rb effect of optical pumping. Phys Rev A 67:065801
Zanon T, Guerandel S, de Clercq E, Holleville D, Dimarcq N, Clairon A (2005) High contrast ramsey fringes with coherent-population-trapping pulses in a double lambda atomic system. Phys Rev Lett 94:193002
Zibrov SA, Velichansky VL, Zibrov AS, Taichenachev AV, Yudin VI (2005) Experimental investigation of the dark pseudoresonance on the D1 line of the 87Rb atom excited by a linearly polarized field. JETP Lett 82(8):477–481
Jau Y-Y, Miron E, Post AB, Kuzma NN, Happer W (2004) Push–pull optical pumping of pure superposition states. Phys Rev Lett 93:160802
Kargapoltsev SV, Kitching J, Hollberg L, Taichenachev AV, Velichansky VL, Yudin VI (2004) High-contrast dark resonance in σ+–σ− optical field. Laser Phys Lett 1(10):495–499
Zhang Y, Qu S, Gu S (2012) Spin-polarized dark state free CPT state preparation with co-propagating left and right circularly polarized lasers. Opt Express 20(6):6400–6405
Knappe SA, Robinson HG, Hollberg L (2007) Microfabricated saturated absorption laser spectrometer. Opt Express 15(10):6293–6299
Chinese invention patent pending, Wuhan Institute of Physics and Math, China Academy of Sciences, Wuhan, China
Camparo J, Huang M, Coffer J (2007) Laser polarization noise & CPT atomic clock signals. In: Frequency control symposium 2007 joint with the 21st European frequency and time forum, IEEE International
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Zhang, Y., Gu, S. (2013). Novel Scheme for Chip-Scale CPT Atomic Clock. In: Sun, J., Jiao, W., Wu, H., Shi, C. (eds) China Satellite Navigation Conference (CSNC) 2013 Proceedings. Lecture Notes in Electrical Engineering, vol 245. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37407-4_36
Download citation
DOI: https://doi.org/10.1007/978-3-642-37407-4_36
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-37406-7
Online ISBN: 978-3-642-37407-4
eBook Packages: EngineeringEngineering (R0)