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Université de Neuchâtel

Light-shift suppression in laser optically pumped vapour-cell atomic frequency standards

Affolderbach, Christoph ; Andreeva, C. ; Cartaleva, S. ; Karaulanov, T. ; Mileti, Gaetano ; Slavov, D

In: Applied Physics B: Lasers and Optics, 2005, vol. 80, no. 7, p. 841-848

We present a novel scheme for reducing the AC Stark effect in optical-microwave double-resonance spectroscopy and its application for efficient suppression of the light-shift-related instabilities in laser-pumped gas-cell atomic clocks. The method uses a multi-frequency pump light field that can be easily produced by frequency modulation of the single-frequency pump laser. We show theoretically...

Université de Neuchâtel

Diode laser frequency stabilisation for water-vapour differential absorption sensing

Matthey, Renaud ; Schilt, Stéphane ; Werner, D. ; Affolderbach, Christoph ; Thévenaz, Luc ; Mileti, Gaetano

In: Applied Physics B : Lasers and Optics, 2006, vol. 85, no. 2-3, p. 477-485

We describe a low-power continuous-wave laser system for water-vapour sensing applications in the 935-nm region. The system is based on extended-cavity diode lasers and distributed-feedback lasers and delivers four single-mode frequency-stabilised optical signals. Three lasers are locked to three water-vapour absorption lines of different strengths, whereas the fourth lies outside any absorption...

Université de Neuchâtel

Experimental demonstration of a compact and high-performance laser-pumped rubidium gas cell atomic frequency standard

Affolderbach, Christoph ; Droz, F. ; Mileti, Gaetano

In: IEEE Transactions on Instrumentation and Measurement, 2006, vol. 55, no. 2, p. 429-435

The authors present a compact high-performance laser-pumped Rubidium atomic frequency standard exploiting the advantages of laser optical pumping for improved stability. The clock is based on an industrial Rb clock with the lamp assembly removed and optically pumped by light from a compact frequency-stabilized laser head. The modification of the buffer gas filling in the clock resonance cell...

Université de Neuchâtel

Influence of laser sources with different spectral properties on the performance of vapor cell atomic clocks based on lin‖lin CPT

Breschi, Evelina ; Kazakov, G. ; Lammegger, R. ; Matisov, B. ; Windholz. L. ; Mileti, Gaetano

In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2009, vol. 56, no. 5, p. 926-930

We evaluate the influence of 2 types of laser sources with different spectral profiles on the performance of vapor cell atomic clocks based on lin||lin coherent population trapping (CPT) resonances. We show that a short-term stability of 1-2 • 10-11Τ-1/2 may be reached in a compact system using a modulated vertical cavity surface-emitting laser. Here the stability is...

Université de Neuchâtel

Quadratic dependence on temperature of Cs 0-0 hyperfine resonance frequency in single Ne buffer gas microfabricated vapour cell

Miletic, Danijela ; Dziuban, Piotr ; Boudot, Rodolphe ; Hasegawa, M. ; Chutani, R.K. ; Mileti, Gaetano ; Giordano, Vincent ; Gorecki, Christophe

In: Electronics Letters, 2010, vol. 46, no. 15, p. 1069-1071

Presented is the observation of a quadratic temperature dependence of the Cs 0-0 ground state hyperfine resonance frequency in a single Neon (Ne) buffer gas vapour microcell. The inversion temperature, expected to be theoretically independent of the buffer gas pressure, is measured to be about 80-C for two different samples. A proposal to develop chip scale atomic clocks with improved long-term...

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

Evaluation of the frequency stability of a VCSEL locked to a micro-fabricated Rubidium vapour cell

Di Francesco, Joab F. ; Gruet, Florian ; Schori, Christian ; Affolderbach, Christoph ; Matthey, Renaud ; Mileti, Gaetano ; Salvadé, Y. ; de Rooij, Nicolaas F. ; Petremand, Y.

In: Semiconductor Lasers and Laser Dynamics IV, 2010, vol. 7720, no. 77201T, p. 1-9

We present our evaluation of a compact laser system made of a 795 nm VCSEL locked to the Rubidium absorption line of a micro-fabricated absorption cell. The spectrum of the VCSEL was characterised, including its RIN, FM noise and line-width. We optimised the signal-to-noise ratio and determined the frequency shifts versus the cell temperature and the incident optical power. The frequency...

Université de Neuchâtel

Laser offset-frequency locking up to 20 GHz using a low-frequency electrical filter technique

Schilt, Stéphane ; Matthey, Renaud ; Kauffmann-Werner, Daniela ; Affolderbach, Christoph ; Mileti, Gaetano ; Thévenaz, Luc

In: Applied Optics, 2008, vol. 47, no. 24, p. 4336-4344

A simple, easy-to-implement, and robust technique is reported to offset lock two semiconductor lasers with a frequency difference easily adjustable up to a couple of tens of gigahertz (10 and 19 GHz experimentally demonstrated). The proposed scheme essentially makes use of low-frequency control electronics and may be implemented with any type of single mode semiconductor laser, without any...

Université de Neuchâtel

Quantitative study of the destructive quantum-interference effect on coherent population trapping

Breschi, E. ; Kazakov, G. ; Lammegger, R. ; Mileti, Gaetano ; Matisov, B. ; Windholz. L.

In: Physical Review A, 2009, vol. 79, no. 6, p. 063837-1

We investigate experimentally and theoretically the coherent population trapping (CPT) effect occurring in 87Rb D1 line due to the interaction with linearly polarized laser light (lin∥lin CPT). In this configuration, the coherence is strongly influenced by the structure of the excited state; consequently, the quantum interference between dark states is an essential feature...

Université de Neuchâtel

Optical Clocks in Space

Schiller, S. ; Görlitz, A. ; Nevsky, A. ; Koelemeij, J.C.J. ; Wicht, A. ; Gill, P. ; Klein, H.A. ; Margolis, H.S. ; Mileti, Gaetano ; Sterr, U. ; Riehle, F. ; Peik, E. ; Tamm, Chr. ; Ertmer, W. ; Rasel, E. ; Klein, V. ; Salomon, C. ; Tino, G.M. ; Lemonde, P. ; Holzwarth, P. ; Hänsch, T.W.

In: Nuclear Physics B - Proceedings Supplements, 2007, vol. 166, p. 300-302

The performance of optical clocks has strongly progressed in recent years, and accuracies and instabilities of 1 part in 1018 are expected in the near future. The operation of optical clocks in space provides new scientific and technological opportunities. In particular, an earth-orbiting satellite containing an ensemble of optical clocks would allow a precision measurement of the...