Raman–Ramsey Interaction for Coherent Population Trapping Cs Clock

Guérandel, Stéphane; Zanon, T.; Castagna, N.; Dahes, F.; Clercq, Emeric de; Dimarcq, N.; Clairon, A.

doi:10.1109/tim.2007.891124

Cited by 45 publications

(41 citation statements)

References 9 publications

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“…for T R ∼ T 2 . This behaviour has been already reported in numerous articles [8,22,32]. 6(c), we found that the clock short-term frequency stability is optimized for pumping times in the 1-2 ms range.…”

Section: Experimental Set-upsupporting

confidence: 87%

A high-performance Raman-Ramsey Cs vapor cell atomic clock

Hafiz

Coget

Yun

et al. 2017

Journal of Applied Physics

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We demonstrate a high-performance coherent-population-trapping (CPT) Cs vapor cell atomic clock using the push-pull optical pumping technique (PPOP) in the pulsed regime, allowing the detection of high-contrast and narrow Ramsey-CPT fringes. The impact of several experimental parameters onto the clock resonance and short-term fractional frequency stability, including the laser power, the cell temperature and the Ramsey sequence parameters, has been investigated. We observe and explain the existence of a slight dependence on laser power of the central Ramsey-CPT fringe line-width in the pulsed regime. We report also that the central fringe line-width is commonly narrower than the expected Ramsey linewidth given by 1/(2T R ), with T R the free-evolution time, for short values of T R . The clock demonstrates a short-term fractional frequency stability at the level of 2.3 × 10 −13 τ

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Section: Experimental Set-upsupporting

confidence: 87%

A high-performance Raman-Ramsey Cs vapor cell atomic clock

Hafiz

Coget

Yun

et al. 2017

Journal of Applied Physics

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“…The ratio contrast/linewidth is maximized for T = T 2 = 3 ms. This result indicates that a Ramsey time T = T 2 is a good trade-off between a large signal and a narrow fringe for atomic clocks applications, as already observed in [23] and [24]. Figure 7 plots the contrast of the central fringe versus the laser power P L for T = 5 ms and τ p = 2 ms.…”

Section: Pulsed Interaction With a Mz Eomsupporting

confidence: 59%

Ramsey spectroscopy of high-contrast CPT resonances with push-pull optical pumping in Cs vapor

Liu¹,

Mérolla²,

Guérandel³

et al. 2013

Opt. Express

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Abstract:We report on the detection of high-contrast and narrow Coherent Population Trapping (CPT) Ramsey fringes in a Cs vapor cell using a simple-architecture laser system. The latter allows the combination of push-pull optical pumping (PPOP) and a temporal Ramsey-like pulsed interrogation. An originality of the optics package is the use of a single Mach-Zehnder electro-optic modulator (MZ EOM) both for optical sidebands generation and light switch for pulsed interaction. Typical Ramsey fringes with a linewidth of 166 Hz and a contrast of 33 % are detected in a cm-scale buffer-gas filled Cs vapor cell. This technique could be interesting for the development of high-performance and low power consumption compact vapor cell clocks based on CPT.

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“…15, it is maximized at T = 3.3 ms. This value corresponds to the hyperfine coherence lifetime in the cell, as expected [20]. …”

Section: Clock Transition Amplitudesupporting

confidence: 72%

Coherent population trapping with polarization modulation

Yun

Guérandel

Clercq

2016

Journal of Applied Physics

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Coherent population trapping (CPT) is extensively studied for future vapor cell clocks of high frequency stability. In the constructive polarization modulation CPT scheme, a bichromatic laser field with polarization and phase synchronously modulated is applied on an atomic medium. A high contrast CPT signal is observed in this so-called double-modulation configuration, due to the fact that the atomic population does not leak to the extreme Zeeman states, and that the two CPT dark states, which are produced successively by the alternate polarizations, add constructively. Here we experimentally investigate CPT signal dynamics first in the usual configuration, a single circular polarization. The double-modulation scheme is then addressed in both cases: one pulse Rabi interaction and two pulses Ramsey interaction. The impact and the optimization of the experimental parameters involved in the time sequence are reviewed. We show that a simple sevenlevel model explains the experimental observations. The double-modulation scheme yields a high contrast similar to the one of other high contrast configurations like push-pull optical pumping or crossed linear polarization scheme, with a setup allowing a higher compactness. The constructive polarization modulation is attractive for atomic clock, atomic magnetometer and high precision spectroscopy applications.

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Raman–Ramsey Interaction for Coherent Population Trapping Cs Clock

Cited by 45 publications

References 9 publications

A high-performance Raman-Ramsey Cs vapor cell atomic clock

A high-performance Raman-Ramsey Cs vapor cell atomic clock

Ramsey spectroscopy of high-contrast CPT resonances with push-pull optical pumping in Cs vapor

Coherent population trapping with polarization modulation

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