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Miletic, Danijela
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Miletic, Danijela
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Doctorante
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Voici les éléments 1 - 9 sur 9
- PublicationAccès libreMetrological characterization of custom-designed 894.6 nm VCSELs for miniature atomic clocks(2013-11-8)
; ; ; ; Michalzik, Rainer - PublicationMétadonnées seulementAC Stark-shift in CPT-based Cs miniature atomic clocks(2012-9-21)
; ; - PublicationAccès libreAc Stark shift in double resonance and coherent population trapping in a wall-coated cell for compact Rb atomic clocks(2012-4-27)
; ; 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 a function of the laser intensity and the laser frequency and compared with existing theoretical results - PublicationAccès libreFirst-order cancellation of the Cs clock frequency temperature-dependence in Ne-Ar buffer gas mixture(2011)
; ; ; - PublicationMétadonnées seulementSpectroscopy of micro-fabricated Cs vapour cells for miniature atomic clocks(2010-9-20)
; ; In this paper we present our spectroscopic studies on Coherent Population Trapping (CPT) in micro-fabricated Caesium cells and our evaluation of its application in miniature atomic frequency standards (atomic clocks). We observe the CPT signal on the Cs D1-line by coupling two hyperfine ground-state Zeeman sub-levels to a common excited state using two coherent electromagnetic fields created with a modulated DFB laser. Contrarily to double resonance, CPT does not require any microwave cavity, which should facilitate the miniaturization of a future atomic clock device. We study and report here on the light shift phenomena at different cell temperatures and laser wavelength. We also present resonance shifts due to cell temperature variations and clock frequency stability measurements. To the best of our knowledge, this article is the first report on light shift with Cs D1 line in a CPT vapour-cell atomic clock. - PublicationMétadonnées seulementOptimizing a high-stability cw laser-pumped Rubidium gas-cell frequency standard(USA: Maleki Lute, 2009)
; ; ; We report on our development of a compact and high-performance laser-pumped Rubidium atomic frequency standard. The clock design is based on optical-microwave double-resonance using cw optical pumping, and a physical realization as simple as possible. Main development goals are a short-term instability of ≤ 6 × 10-13 τ-1/2 and a flicker floor of ≤ 1 × 10-14 up to one day. Here we discuss our approaches for controlling the clock's main physical parameters in view of optimized frequency stability. - PublicationAccès libreMetrological characterization of custom-designed 894.6 nm VCSELs for miniature atomic clocks
; ; ; ; Michalzik, RainerWe report on the characterization and validation of custom-designed 894.6 nm vertical-cavity surface-emitting lasers (VCSELs), for use in miniature Cs atomic clocks based on coherent population trapping (CPT). The laser relative intensity noise (RIN) is measured to be 1×10−11 Hz−1 at 10 Hz Fourier frequency, for a laser power of 700 μW. The VCSEL frequency noise is 1013 ƒ −1 Hz2/Hz in the 10 Hz < ƒ < 105 Hz range, which is in good agreement with the VCSEL’s measured fractional frequency instability (Allan deviation) of ≈ 1 × 10−8 at 1 s, and also is consistent with the VCSEL’s typical optical linewidth of 20–25 MHz. The VCSEL bias current can be directly modulated at 4.596 GHz with a microwave power of −6 to +6 dBm to generate optical sidebands for CPT excitation. With such a VCSEL, a 1.04 kHz linewidth CPT clock resonance signal is detected in a microfabricated Cs cell filled with Ne buffer gas. These results are compatible with state-of-the-art CPT-based miniature atomic clocks exhibiting a short-term frequency instability of 2–3×10−11 at τ = 1 s and few 10−12 at τ = 104 s integration time. - PublicationAccès libreAC Stark-shift in CPT-based Cs miniature atomic clocks
; ; - PublicationAccès libreac Stark shift in double resonance and coherent population trapping in a wall-coated cell for compact Rb atomic clocksWe 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 a function of the laser intensity and the laser frequency and compared with existing theoretical results.