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Université de Neuchâtel

Characterizing the carrier-envelope offset in an optical frequency comb without traditional f-to-2f interferometry

Brochard, Pierre ; Schilt, Stéphane ; Wittwer, Valentin J ; Südmeyer, Thomas

In: Optics Letters, 2015, vol. 40, no. 23, p. 5522-5525

We present a new method to measure the frequency noise and modulation response of the carrier-envelope offset (CEO) beat of an optical frequency comb that does not make use of the traditional f-to-2f interferometry. Instead, we use an appropriate combination of different signals to extract the contribution of the CEO frequency without directly detecting it. We present a...

Université de Fribourg

Der Verfassungseid und die Verfassung der Eide

In: Verfassungsidee und Verfassungspolitik, 2015, p. 373-378

Université de Neuchâtel

Analyse de l'arrêt du Tribunal fédéral 4A_24/2015

Chavanne, Michel

In:, 2015, no. Novembre, p. 1-5

Université de Fribourg

Visualization of polymer deformation using microcapsules filled with charge-transfer complex precursors

Lavrenova, Anna ; Farkas Jacob ; Weder, Christoph ; Simon, Yoan C.

In: ACS Appl. Mater. Interfaces, 2015, vol. 7, no. 39, p. 21828–21834

The visualization of polymer deformation using microcapsules filled with charge-transfer complex precursors is reported. Poly(urea-formaldehyde) microcapsules filled with toluene and either hexamethylbenzene as donor or chloranil as acceptor were prepared by in situ polymerization of an oil-in-water emulsion. The resulting microcapsules were incorporated in a poly(dimethylsiloxane) matrix by...

Université de Neuchâtel

Green-diode-pumped femtosecond Ti:Sapphire laser with up to 450 mW average power

Gürel, Kutan ; Wittwer, Valentin J ; Hoffmann, Martin ; Saraceno, Clara J ; Hakobyan, Sargis ; Resan, B ; Rohrbacher, A ; Weingarten, K ; Schilt, Stéphane ; Südmeyer, Thomas

In: Optics Express, 2015, vol. 23, no. 23, p. 30043-30048

We investigate power-scaling of green-diode-pumped Ti:Sapphire lasers in continuous-wave (CW) and mode-locked operation. In a first configuration with a total pump power of up to 2 W incident onto the crystal, we achieved a CW power of up to 440 mW and self-starting mode-locking with up to 200 mW average power in 68-fs pulses using semiconductor saturable absorber mirror (SESAM) as saturable...

Université de Neuchâtel

Imaging Microwave and DC Magnetic Fields in a Vapor-Cell Rb Atomic Clock

Affolderbach, Christoph ; Du, Guan-Xiang ; Bandi, Thejesh ; Horsley, Andrew ; Treutlein, Philipp ; Mileti, Gaetano

In: IEEE Transactions on Instrumentation and Measurement, 2015, vol. 64, no. 12, p. 3629-3637

We report on the experimental measurement of the dc and microwave magnetic field distributions inside a recently developed compact magnetron-type microwave cavity mounted inside the physics package of a high-performance vapor-cell atomic frequency standard. Images of the microwave field distribution with sub-100- μm lateral spatial resolution are obtained by pulsed optical-microwave Rabi...

Université de Fribourg

Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

Afach, S. ; Ayres, N. J. ; Ban, G. ; Bison, Georg ; Bodek, K. ; Chowdhuri, Z. ; Daum, M. ; Fertl, M. ; Franke, B. ; Griffith, W. C. ; Grujić, Z. D. ; Harris, P. G. ; Heil, W. ; Hélaine, V. ; Kasprzak, Malgorzata ; Kermaidic, Y. ; Kirch, K. ; Knowles, Paul E. ; Koch, H.-C. ; Komposch, S. ; Kozela, A. ; Krempel, J. ; Lauss, B. ; Lefort, T. ; Lemière, Y. ; Mtchedlishvili, A. ; Musgrave, M. ; Naviliat-Cuncic, O. ; Pendlebury, J. M. ; Piegsa, F. M. ; Pignol, G. ; Plonka-Spehr, C. ; Prashanth, P. N. ; Quéméner, G. ; Rawlik, M. ; Rebreyend, D. ; Ries, D. ; Roccia, S. ; Rozpedzik, D. ; Schmidt-Wellenburg, P. ; Severijns, N. ; Thorne, J. A. ; Weis, Antoine ; Wursten, E. ; Wyszynski, G. ; Zejma, J. ; Zenner, J. ; Zsigmond, G.

In: Physical Review Letters, 2015, vol. 115, no. 16, p. 162502

We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a |B0|=1 μT magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons. The method...

Université de Neuchâtel

Stability limitations from optical detection in Ramsey-type vapour-cell atomic clocks

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

In: Electronics Letters, 2015, vol. 51, no. 22, p. 1767-1769

In today’s state of the art compact vapour-cell atomic clocks relying on the pulsed Ramsey-type interrogation, optical detection noise is a major limitation to the achievable short-term stability. In this communication, the influence of the optical detection time on the clock’s short-term stability is investigated and a new analytical expression is developed to precisely predict the stability...