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Université de Neuchâtel

AC Stark-shift in CPT-based Cs miniature atomic clocks

Miletic, Danijela ; Affolderbach, Christoph ; Hasegawa, M. ; Boudot, R. ; Gorecki, C. ; Mileti, Gaetano

In: Applied Physics B: Lasers and Optics, 2012, vol. 109, no. 1, p. 89-97

We report on studies on the light-shift in caesium miniature atomic clocks based on coherent population trapping (CPT) using a micro-fabricated buffer-gas cell (MEMS cell). The CPT signal is observed on the Cs D1-line by coupling the two hyperfine ground-state Zeeman sublevels involved in the clock transition to a common excited state, using two coherent electromagnetic fields. These light fields...

Université de Neuchâtel

ac Stark shift in double resonance and coherent population trapping in a wall-coated cell for compact Rb atomic clocks

Miletic, Danijela ; Bandi Nagabhushan, Thejesh ; Affolderbach, Christoph ; Mileti, Gaetano

In: Physica Scripta, 2012, vol. T149, p. 014012 (3pp)

We present a comparative study of the light-shifts (ac Stark shift) in a Rb vapour cell using two possible schemes for Rb atomic clocks: double resonance (DR) and coherent population trapping (CPT). For both schemes, the same wall-coated cell in a compact atomic resonator was used. The light-shift resulting from a monochromatic (DR) or a non-monochromatic (CPT) optical excitation was measured as...

Université de Neuchâtel

Aging studies on micro-fabricated alkali buffer-gas cells for miniature atomic clocks

Abdullah, Salman ; Affolderbach, Christoph ; Gruet, Florian ; Mileti, Gaetano

In: Applied Physics Letters, 2015/106//163505/1-5

We report an aging study on micro-fabricated alkali vapor cells using neon as a buffer gas. An experimental atomic clock setup is used to measure the cell’s intrinsic frequency, by recording the clock frequency shift at different light intensities and extrapolating to zero intensity. We find a drift of the cell’s intrinsic frequency of (-5.2 ± 0.6) × 10-11/day and quantify...

Université de Neuchâtel

An alternative cold cesium frequency standard: the continuous fountain

Dudle, G. ; Mileti, Gaetano ; Joyet, Alain ; Fretel, Emmanuel ; Berthoud, P. ; Thomann, Pierre

In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2000, vol. 47, no. 2, p. 438-442

We report on the primary frequency standard now under construction at the Observatoire de Neuchatel (ON). The design is based on a continuous fountain of laser-cooled cesium atoms, which combines two advantages: the negligible contribution of collisions to the inaccuracy and the absence of stability degradation caused by aliasing effects encountered in pulsed operation. The design is reviewed...

Université de Neuchâtel

Characterization of Frequency-Doubled 1.5-μm Lasers for High-Performance Rb Clocks

Almat, Nil ; Moreno, William ; Pellaton, Matthieu ; Gruet, Florian ; Affolderbach, Christoph ; Mileti, Gaetano

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2018, vol. 65, no. 6, p. 919-926

We report on the characterization of two fiber-coupled 1.5- μm diode lasers, frequency-doubled and stabilized to Rubidium (Rb) atomic resonances at 780 nm. Such laser systems are of interest in view of their implementation in Rb vaporcell atomic clocks, as an alternative to lasers emitting directly at 780 nm. The spectral properties and the instabilities of the frequency-doubled lasers are...

Université de Neuchâtel

Compact High-Performance Continuous-Wave Double-Resonance Rubidium Standard with 1.4 × 10−13 τ −1/2 Stability

Bandi, Thejesh ; Affolderbach, Christoph ; Stefanucci, Camillo ; Merli, Francesco ; Skrivervik, Anja K ; Mileti, Gaetano

In: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014, vol. 61, no. 11, p. 1769-1778

We present our studies on a compact high-performance continuous wave (CW) double-resonance (DR) rubidium frequency standard in view of future portable applications. Our clock exhibits a short-term stability of 1.4 × 10−13 τ −1/2, consistent with the short-term noise budget for an optimized DR signal. The metrological studies on the medium- to longterm stability...

Université de Neuchâtel

A compact laser head with high-frequency stability for Rb atomic clocks and optical instrumentation

Affolderbach, Christoph ; Mileti, Gaetano

In: Review of Scientific Instruments, 2005, vol. 76, no. 7, p. 073108 1-5

We present a compact and frequency-stabilized laser head based on an extended-cavity diode laser. The laser head occupies a volume of 200 cm3 and includes frequency stabilization to Doppler-free saturated absorption resonances on the hyperfine components of the 87Rb D2 lines at 780 nm, obtained from a simple and compact spectroscopic setup using a...

Université de Neuchâtel

Compact microwave cavity for high performance rubidium frequency standards

Stefanucci, Camillo ; Bandi Nagabhushan, Thejesh ; Merli, Francesco ; Pellaton, Matthieu ; Affolderbach, Christoph ; Mileti, Gaetano ; Skrivervik, Anja K.

In: Review of Scientific Instruments, 2012/83/10/104706-1/8

The design, realization, and characterization of a compact magnetron-type microwave cavity operating with a TE011-like mode are presented. The resonator works at the rubidium hyperfine ground-state frequency (i.e., 6.835 GHz) by accommodating a glass cell of 25 mm diameter containing rubidium vapor. Its design analysis demonstrates the limitation of the loop-gap resonator lumped model...

Université de Neuchâtel

Compact rubidium-stabilized multi-frequency reference source in the 1.55-μm region

Matthey, Renaud ; Gruet, Florian ; Schilt, Stéphane ; Mileti, Gaetano

In: Optics Letters, 2015, vol. 40, no. 11, p. 2576-2579

Combining light modulation and frequency conversion techniques, a compact and simple frequency-stabilized optical frequency comb spanning over 45 nm in the 1.56- μm wavelength region is demonstrated. It benefits from the high-frequency stability achievable from rubidium atomic transitions at 780 nm probed in a saturation absorption scheme, which is transferred to the 1.56- μm spectral region...

Université de Neuchâtel

Demonstration of a high-performance pulsed optically pumped Rb clock based on a compact magnetron-type microwave cavity

Kang, Songbai ; Gharavipour, Mohammadreza ; Affolderbach, Christoph ; Gruet, Florian ; Mileti, Gaetano

In: Journal of Applied Physics, 2015/117//104510/1-5

We demonstrate a high-performance pulsed optically pumped (POP) Rb vapor-cell clock based on a magnetron-type microwave cavity of only 44 cm3 external volume. Using optical detection, an unprecedented 35% contrast of the Ramsey signal has been obtained. Both the signal-to-noise ratio (of 30 000) and the estimated shot-noise limit of 1.7×10-14τ-1/2 are at...