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La recherche d'une langue parfaite a fascine les auteurs de science-fiction de l'ecole ca... more La recherche d'une langue parfaite a fascine les auteurs de science-fiction de l'ecole campbellienne. L'article retrace l'engagement de quelques-uns d'entre eux, derriere Robert Heinlein et John Campbell, dans l'etude de la "semantique generale" d'Alfred Korzybski, puis le detournement de ces idees vers la "Dianetique" de L. Ron Hubbard, jusqu'a la fondation de la "Scientologie".
HAL (Le Centre pour la Communication Scientifique Directe), Mar 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2020
Stimulated Brillouin scattering (SBS) of visible light in a small-core photonic crystal fiber (PC... more Stimulated Brillouin scattering (SBS) of visible light in a small-core photonic crystal fiber (PCF) resonator of small external Q-factor, experimentally presents trains of subluminous and superluminous pulses presenting all the characteristics of dissipatif Brillouin solitons. Insertion of the acoustic dispersion, which may be significant in PCF, in the coherent SBS three-wave model modify the dissipative structures. For special pump wavelengths the acoustic dispersion response may be particularly strong and may lead to an enhanced Brillouin mirror.
HAL (Le Centre pour la Communication Scientifique Directe), 2021
HAL (Le Centre pour la Communication Scientifique Directe), Mar 1, 2019
HAL (Le Centre pour la Communication Scientifique Directe), Sep 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), 2021
HAL (Le Centre pour la Communication Scientifique Directe), Nov 1, 2020
Somnium, May 1, 2009
International audienc
Somnium, May 1, 2009
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2008
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Identification de compétences (pré-)scientifiques chez des élèves d’école maternelle : de l’utilité de croiser les cadres théoriques pour l’analyse émergente d’une vidéo Estelle Blanquet, Christina Siry, Éric Picholle
Lasers are often perceived as threshold devices, with a rapid all-or-nothing transition around th... more Lasers are often perceived as threshold devices, with a rapid all-or-nothing transition around threshold. This approach usually holds for high quality factor (“Class A”) devices or macroscopic ones, but fails to correctly describe the transition in very small components. The long carrier lifetime – compared to the cavity time – typical of semiconductor-based micro- and nanolasers (“Class B” devices) introduces an additional element of complexity to the problem due to the nonlinear dynamical evolution of the coherent fraction of electromagnetic field, and opens questions on coherence buildup. Below threshold, the characterization of the latter is rendered difficult due to the small number of photons contained in the laser cavity at any given time, thus yielding very low optical intensity levels, close to or below the sensitivity limit of standard photodetectors. Fortunately, recent telecom-based quantum measurement techniques now allow the indirect characterization of the laser’s response through its second order correlation function, g^(2)(τ).
La recherche d'une langue parfaite a fascine les auteurs de science-fiction de l'ecole ca... more La recherche d'une langue parfaite a fascine les auteurs de science-fiction de l'ecole campbellienne. L'article retrace l'engagement de quelques-uns d'entre eux, derriere Robert Heinlein et John Campbell, dans l'etude de la "semantique generale" d'Alfred Korzybski, puis le detournement de ces idees vers la "Dianetique" de L. Ron Hubbard, jusqu'a la fondation de la "Scientologie".
HAL (Le Centre pour la Communication Scientifique Directe), Mar 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2020
Stimulated Brillouin scattering (SBS) of visible light in a small-core photonic crystal fiber (PC... more Stimulated Brillouin scattering (SBS) of visible light in a small-core photonic crystal fiber (PCF) resonator of small external Q-factor, experimentally presents trains of subluminous and superluminous pulses presenting all the characteristics of dissipatif Brillouin solitons. Insertion of the acoustic dispersion, which may be significant in PCF, in the coherent SBS three-wave model modify the dissipative structures. For special pump wavelengths the acoustic dispersion response may be particularly strong and may lead to an enhanced Brillouin mirror.
HAL (Le Centre pour la Communication Scientifique Directe), 2021
HAL (Le Centre pour la Communication Scientifique Directe), Mar 1, 2019
HAL (Le Centre pour la Communication Scientifique Directe), Sep 1, 2021
HAL (Le Centre pour la Communication Scientifique Directe), 2021
HAL (Le Centre pour la Communication Scientifique Directe), Nov 1, 2020
Somnium, May 1, 2009
International audienc
Somnium, May 1, 2009
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), May 1, 2008
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Identification de compétences (pré-)scientifiques chez des élèves d’école maternelle : de l’utilité de croiser les cadres théoriques pour l’analyse émergente d’une vidéo Estelle Blanquet, Christina Siry, Éric Picholle
Lasers are often perceived as threshold devices, with a rapid all-or-nothing transition around th... more Lasers are often perceived as threshold devices, with a rapid all-or-nothing transition around threshold. This approach usually holds for high quality factor (“Class A”) devices or macroscopic ones, but fails to correctly describe the transition in very small components. The long carrier lifetime – compared to the cavity time – typical of semiconductor-based micro- and nanolasers (“Class B” devices) introduces an additional element of complexity to the problem due to the nonlinear dynamical evolution of the coherent fraction of electromagnetic field, and opens questions on coherence buildup. Below threshold, the characterization of the latter is rendered difficult due to the small number of photons contained in the laser cavity at any given time, thus yielding very low optical intensity levels, close to or below the sensitivity limit of standard photodetectors. Fortunately, recent telecom-based quantum measurement techniques now allow the indirect characterization of the laser’s response through its second order correlation function, g^(2)(τ).