Searcharxiv⌕ Search

arXiv subjects

Olivier Morizot

Publications and source records attributed to Olivier Morizot.

14 recordsLinked to original sources
arXiv2026

The wavelength of light as Thomas Young invented it

This paper documents Thomas Young's invention of a concept which he alternately refers to as the ''magnitude'', ''breadth'', ''interval'' or ''length of an undulation'' of light. First, the paper highlights that Young was first to link some concept of a wavelength to a theory of optics and to assign a precise value to this length for each component of the colour spectrum. Then, it sets out an explanation of how Young made up these values. Finally, it examines the reasons why Young introduced an optical wavelength into his theory of light, insofar as these reasons might in turn shed light on why he was first to do so.

physics.hist-ph↗
arXiv2023

David Brewster's and William Herschel's experiments on inflection that delivered the coup de gr{â}ce to Thomas Young's ether distribution hypothesis

In his Theory of Light and Colours, presented to the Royal Society in November 1801, Thomas Young defended a mechanical explanation of the coloured fringes observed outside of the shadow of an opaque object-the so-called 'colours by inflection'-that was based on the hypothesis of an ethereal density gradient surrounding all material bodies. However, two years later, he publicly rejected that hypothesis, without giving much detail on his reasons. Now, although Geoffrey Cantor demonstrated the crucial role of mechanical and astronomical arguments in explaining the withdrawal of this fundamental hypothesis long ago, the purpose of this article is to draw deeper attention on a set of experiments performed by David Brewster on the inflection of light, described in a letter he addressed to the Royal Society in January 1802, but which kept retained in the hands of William Herschel and never reached its original destination. For the hypothesis that will be evaluated here is that these unpublished experiments of Brewster's were eventually known to Young through the mediation of William Herschel, and eventually played a significant role in his rejection of his own ether distribution hypothesis too.

physics.hist-ph↗
arXiv2023

Historical synthesis supporting Duhem's demonstration of the impossibility of the `experimentum crucis' of comparison of the speed of light in air and water

In 1850, Foucault was the first to compare experimentally the velocity of light in air to its velocity in water. And as the wave and projectile theories competing at the time predicted inverse results to such a measurement, Foucault ''declared the emission system incompatible with the reality of the facts''. Yet, in his Physical Theory, Duhem uses this very example to illustrate his epistemological demonstration of the impossibility of the 'experimentum crucis' in physics. Then, the ambition of the present article is to augment Duhem's demonstration with historical evidence relating precisely to the question of the speed of light in water. We will review the four major opinions on the nature of light developed between 1637 and 1801; all leading to theories concluding that the ratio of sines is constant and equal to the ratio of the velocities in the two media, but all being defended by at least two authors concluding to inverse ratios of those velocities -- and thus to opposite predictions on the result of an experiment such as Foucault's. The convergence of historical evidence will then confirm that the nature of light, considered in isolation, is in no way constrained by the measurement of its speed in water.

physics.hist-ph↗
arXiv2021

Traduction commentée en français de la Conférence Bakerienne Sur le Mécanisme de l'Oeil de Thomas Young (1800)

On November 27, 1800, Thomas Young presents for the second time to the Royal Society of London his theory of the musclurity of the crystalline lens, as being the cause of the accommodation of the eye to different distances. This question had indeed been the topic of his very first communication to the Royal Society seven years earlier; from which he had been forced to withdraw in the meanwhile by a series of articles claiming either the priority on his discovery, or the demonstration of it being erroneous. Seven years later, Young turns back to the topic with a very strongly elaborated text indeniably proving the role of the crystalline in accommodation, as well as offering a new and convenient method for measuring the amplitude of accommodation, discovering the default of astigmatism of the eye, and setting the most precise and complete measurement of the living eye of its time. For these reasons, and for the tight intellectual connections between this text and the Theory of Light and Colours Thomas Young will publish a year later, we thought it important to bring a translation and commentary of this text at the disposal of the French audience.

physics.hist-ph↗
arXiv2021

Traduction commmentée en francais de La Conférence Bakerienne sur la Théorie de la Lumière et des Couleurs de Thomas Young

On November 12, 1802, Thomas Young lays down in front of the Royal Society of London his Theory of Light and Colours. In this text, he defends a vibratory model or light, in which the peculiar attention he gives to the consequence of the crossing of two light beams allows him to formulate the first version of the interference principle. And to deduce out of it the first correct justification of the colours of thin plates, from which he computes the very first series of measurements of the wavelength of light ; a concept he introduces for the very occasion. Based on this same principle, he presents the first experience of diffraction from a grating, allowing him to anticipate the reason of the origin of the colours of certain insects and butterflies. Finally, the defense of this vibratory model is also the occasion for him to elaborate the visionary hypothesis of the triple structure of the photoreceptors of the retina involved in colour vision. The very high density of concepts and innovative results embedded in this short text justifies by itself the interest of bringing a translated and commented version of it at the disposal of the French audience.

physics.hist-ph↗
arXiv2016

Noise characterization of an Optical Frequency Comb using Offline Cross-Correlation

Using an offline cross-correlation technique, we have analyzed the noise behavior of a new type of optical frequency comb (OFC), which is carrier envelope offset (CEO) free by configuration, due to difference frequency generation. In order to evaluate the instrument's ultimate noise floor, the phase and amplitude noise of a stabilized OFC are measured simultaneously using two analog-to-digital converters. Carrier recovery and phase detection are done by post-processing, eliminating the need for external phase-locked loops and complex calibration techniques. In order to adapt the measurement noise floor and the number of averages used in cross correlation, an adaptive frequency resolution for noise measurement is applied. Phase noise results are in excellent agreement with measurements of the fluctuations of the repetition frequency of the OFC obtained from optical signal.

physics.ins-det↗
arXiv2013

Coherent internal state transfer by three-photon STIRAP-like scheme for many-atom samples

A STIRAP-like scheme is proposed to exploit a three-photon resonance taking place in alkaline-earth-metal ions. This scheme is designed for state transfer between the two fine structure components of the metastable D-state which are two excited states that can serve as optical or THz qu-bit. The advantage of a coherent three-photon process compared to two-photon STIRAP lies in the possibility of exact cancellation of the first order Doppler shift which opens the way for an application to a sample composed of many ions. The transfer efficiency and its dependence with experimental parameters are analyzed by numerical simulations. This efficiency is shown to reach a fidelity as high as $(1-8.10^{-5})$ with realistic parameters. The scheme is also extended to the synthesis of a linear combination of three stable or metastable states.

quant-ph↗
arXiv2010

A modern Fizeau experiment for education and outreach purposes

On the occasion of the laser's 50th anniversary, we performed a modern Fizeau experiment, measuring the speed of light with a laser beam passing over the city centre of Marseille. For a round trip distance of almost five kilometers, the measurement has reached an uncertainty of about 10$^{-4}$, mainly due to atmospheric fluctuations. We present the experimental and pedagogical challenges of this brilliant outreach experiment.

physics.atom-ph↗
arXiv2007

Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field

We observe the spontaneous evaporation of atoms confined in a bubble-like rf-dressed trap (Zobay and Garraway, 2001). The atoms are confined in a quadrupole magnetic trap and are dressed by a linearly polarized rf field. The evaporation is related to the presence of holes in the trap, at the positions where the rf coupling vanishes, due to its vectorial character. The final temperature results from a competition between residual heating and evaporation efficiency, which is controlled via the height of the holes with respect to the bottom of the trap. The experimental data are modeled by a Monte-Carlo simulation predicting a small increase in phase space density limited by the heating rate. This increase was within the phase space density determination uncertainty of the experiment.

physics.atom-ph↗
arXiv2007

Agile low phase noise radio-frequency sine wave generator applied to experiments on ultracold atoms

We report on the frequency performance of a low cost (~500$) radio-frequency sine wave generator, using direct digital synthesis (DDS) and a field-programmable gate array (FPGA). The output frequency of the device may be changed dynamically to any arbitrary value ranging from DC to 10 MHz without any phase slip. Sampling effects are substantially reduced by a high sample rate, up to 1 MHz, and by a large memory length, more than 2.10^5 samples. By using a low noise external oscillator to clock the DDS, we demonstrate a phase noise as low as that of the master clock, that is at the level of -113 dB.rad^2/Hz at 1 Hz from the carrier for an output frequency of 3.75 MHz. The device is successfully used to confine an ultracold atomic cloud of rubidium 87 in a RF-based trap, and there is no extra heating from the RF source.

physics.atom-ph↗
arXiv2007

Continuous transfer and laser guiding between two cold atom traps

We have demonstrated and modeled a simple and efficient method to transfer atoms from a first Magneto-Optical Trap (MOT) to a second one. Two independent setups, with cesium and rubidium atoms respectively, have shown that a high power and slightly diverging laser beam optimizes the transfer between the two traps when its frequency is red-detuned from the atomic transition. This pushing laser extracts a continuous beam of slow and cold atoms out of the first MOT and also provides a guiding to the second one through the dipolar force. In order to optimize the transfer efficiency, the dependence of the atomic flux on the pushing laser parameters (power, detuning, divergence and waist) is investigated. The atomic flux is found to be proportional to the first MOT loading rate. Experimentally, the transfer efficiency reaches 70%, corresponding to a transfer rate up to 2.7x10^8 atoms/s with a final velocity of 5.5 m/s. We present a simple analysis of the atomic motion inside the pushing-guiding laser, in good agreement with the experimental data.

quant-ph↗
arXiv2006

A ring trap for ultracold atoms

We propose a new kind of toroidal trap, designed for ultracold atoms. It relies on a combination of a magnetic trap for rf-dressed atoms, which creates a bubble-like trap, and a standing wave of light. This new trap is well suited for investigating questions of low dimensionality in a ring potential. We study the trap characteristics for a set of experimentally accessible parameters. A loading procedure from a conventional magnetic trap is also proposed. The flexible nature of this new ring trap, including an adjustable radius and adjustable transverse oscillation frequencies, will allow the study of superfluidity in variable geometries and dimensionalities.

physics.atom-ph↗
arXiv2004

Ultracold atoms confined in rf-induced two-dimensional trapping potentials

We present the experimental implementation of a new trap for cold atoms proposed by O. Zobay and B. M. Garraway. It relies on adiabatic potentials for atoms dressed by a rf field in an inhomogeneous magnetic field. This trap is well suited to confine atoms tightly along one direction to produce a two-dimensional atomic gas. We transferred ultracold atoms into this trap, starting either from thermal samples or Bose--Einstein condensates. In the latter case, technical noise during the loading stage caused heating and prevented us from observing 2D BECs.

quant-ph↗