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Université de Neuchâtel

Methods and evaluation of frequency aging in distributed-feedback laser diodes for rubidium atomic clocks

Matthey, Renaud ; Affolderbach, Christoph ; Mileti, Gaetano

In: Optics Letters, 2011, vol. 36, no. 17, p. 3311-3313

Distributed-feedback laser diodes emitting at 780 nm have been evaluated, with respect to the aging of the injection current required for reaching the rubidium D2 resonance line. Results obtained for lasers operating in air and in vacuum for 9 months are reported. When operated at constant temperature, the laser current required for emission at the wavelength of the desired atomic resonance is...

Université de Neuchâtel

First-order cancellation of the Cs clock frequency temperature-dependence in Ne-Ar buffer gas mixture

Boudot, Rodolphe ; Miletic, Danijela ; Dziuban, Piotr ; Affolderbach, Christoph ; Knapkiewicz, Pawel ; Dziuban, Jan ; Mileti, Gaetano ; Giordano, Vincent ; Gorecki, Christophe

In: Optics Express, 2011, vol. 19, no. 4, p. 3106-3114

Through the detection of Coherent Population Trapping (CPT) resonances, we demonstrate the temperature-dependence cancellation of the Cs clock frequency in microfabricated vapor cells filled with a mixture of Ne and Ar. The inversion temperature at which the Cs clock frequency temperature sensitivity is greatly reduced only depends on the partial pressure of buffer gases and is measured to be...

Université de Neuchâtel

High-performance laser-pumped rubidium frequency standard for satellite navigation

Bandi Nagabhushan, Thejesh ; Affolderbach, Christoph ; Calosso, C.E. ; Mileti, Gaetano

In: Electronic Letters, 2011, vol. 47, no. 12, p. 698–699

Presented is a double-resonance continuous-wave laser-pumped rubidium (Rb) atomic clock with a short-term stability of 4×10−13 τ −1/2 for integration times 1 s ≤ τ ≤ 1000 s, and a medium- to long-term stability reaching the 1×10−14 level at 104 s. The clock uses an Rb vapour cell with increased diameter of 25 mm, accommodated inside a...

Université de Neuchâtel

Tuneable, stabilised diode lasers for compact atomic frequency standards and precision wavelength references

Affolderbach, Christoph ; Mileti, Gaetano

In: Optics and Lasers in Engineering, 2005, vol. 43, no. 3-5, p. 291-302

We describe the ongoing activities in Observatoire Cantonal de Neuchâtel in the fields of precision laser spectroscopy and metrology of Rb atomic vapours. The work is motivated by the potentials of highly stable and narrowband laser light sources for a variety of technical and scientific applications. We describe the use of extended-cavity diode lasers for the realisation of such narrowband...

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...