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Thomann, Pierre
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Thomann, Pierre
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Professeur.e émérite
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pierre.thomann@unine.ch
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Voici les éléments 1 - 6 sur 6
- PublicationMétadonnées seulementRecherches sur les horloges atomiques miniatures et optiques(2007)
; ; ; ; - PublicationMétadonnées seulementCONTINUOUS FOUNTAIN CS STANDARD: STABILITY AND ACCURACY ISSUESWe describe a primary fountain frequency standard operating with a continuous beam of laser-cooled Cs atoms. In such a device, aliasing effects, which may degrade the short-term stability in pulsed fountains, are removed and atomic-noise limited stability can be achieved with a state-of-the art, but commercially available, local oscillator. The present experimental short-term stability is measured to be 2.5 · 10-13τ-1/2. Another feature of the continuous fountain is the reduced atomic density and higher beam temperature which reduces the collisional shift of the atomic frequency below the 10-15 level. The light-shift is an undesirable characteristic of the continuous operation. Without a light-trap, a light-shift of the order of 10-12 has been measured. The shift is stable enough not to affect the frequency stability to 104 seconds (2.5 · 10-15). A rotating light-trap has been constructed and tested to bring the light-shift and the corresponding uncertainty to a negligible level. Various contributions to the accuracy are studied.
- PublicationMétadonnées seulementPump-probe spectroscopy and velocimetry of cold atoms in a slow beam(2001)
; ; In this paper we report on the first purely "pump-probe" nonlinear laser spectroscopy results in a slow atomic beam. We have observed Raman, Rayleigh, and recoil-induced resonances (RIR) in a continuous beam of slow and cold cesium atoms extracted from a two-dimensional (2D) magneto-optical-trap (MOT) with the moving molasses technique. The RIR enabled us to measure the velocity distribution. therefore the average speed (0.6-4 m/s) and temperature (50-500 muK) of the atomic beam. Compared to time of flight, this technique has the advantage of being local, more sensitive in the low-velocity regime (v - PublicationMétadonnées seulementSelf-aligned extended-cavity diode laser stabilized by the Zeeman effect on the cesium D-2 line(2000)
; An extended-cavity diode laser at 852 nm has been built especially for the purpose of cooling and probing cesium atoms. It is a compact, self-aligned, and continuously tunable laser source having a 100-kHz linewidth and 60-mW output power. The electronic control of the laser frequency by the piezodriven external reflector covers a 4.5-kHz bandwidth, allowing full compensation of acoustic frequency noise without any adverse effect on the laser intensity noise. We locked this laser to Doppler-free resonances on the cesium D-2 line by using the Zeeman modulation technique, resulting in the frequency and the intensity of the laser beam being unmodulated. We also tuned the locked laser frequency over a span of 120 MHz by using the de Zeeman effect to shift the F = 4-F' = 5 reference transition. (C) 2000 Optical Society of America. OCIS codes: 140.2020, 140.3570, 140.3600, 260.7490, 300.6460. - PublicationMétadonnées seulementBright, slow, and continuous beam of laser-cooled cesium atoms(1999)
- PublicationMétadonnées seulementAn alternative cold cesium frequency standard: The continuous fountain(: Ieee-Inst Electrical Electronics Engineers Inc, 1999)
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