Ergebnisse einschränken


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 Neuchâtel

Economics in the aftermath of the global financial crisis : a text mining approach

Roquet, Hervé ; Zarin-Nejadan, Milad (Dir.) ; Stoffe, Kilian (Codir.)

Mémoire de master : Université de Neuchâtel, 2015.

Using several text mining techniques on 28,974 abstracts coming from 16 of the most influential academic journals in economics and the National Bureau of Economic Research (NBER), I explore the state of mainstream economics in the aftermath of the financial and economic 2007-2009 crisis. Exploring the variation in the relative term frequency of the most used economic terms, I find that the core...

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 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...

Université de Neuchâtel

Spinoza on Emotion and Akrasia

Remmelzwaal, Christiaan ; Glauser, Richard (Dir.) ; Garber, Daniel (Codir.) ; Koistinen, Olli (Codir.) ; Laerke, Mogens (Codir.) ; LeBuffe, Michael (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

The objective of this doctoral dissertation is to interpret the explanation of akrasia that the Dutch philosopher Benedictus Spinoza (1632-1677) gives in his work The Ethics. One is said to act acratically when one intentionally performs an action that one judges to be worse than another action which one believes one might perform instead. In order to interpret Spinoza’s explanation of akrasia,...

Université de Neuchâtel

Service level improvement through lead time reduction and inventory optimization

Gallmann, Francesco ; Reiner, Gerald (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2015 ; 2495.

This Ph.D. thesis aims to understand, first, why some companies excel at logistics service level while others do not and, second, how to improve logistics service level. More in detail, the goal of this research is to investigate and analyse both the drivers and the obstacles of logistics service level excellence. Logistic service level represents increasingly today, in very competitive...