Thesis (Ph. D.)--University of Oregon, 2001. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 263-280). Also available for download via the World Wide Web; free to University of Oregon users.

Thesis (Ph. D.)--University of Washington, 2003. / Vita. Includes bibliographical references (p. 138-155).

Th.--Sci. phys.--Grenoble--I.N.P., 1980. N°: 26. / Extr. en partie de Physical review letters, 36, 1976 ; 43, 1979, 304-307 ; du Journal de physique. Lettres, 38, 1977, 347-359 et du Congrès international sur les semiconducteurs magnétiques. 1979. Montpellier.

No description available.

Zugl.. Hannover, Univ., Diss., 2010

Ce travail de thèse a pour but le développement d'une source de pompe pour l'OPCPA nanoseconde qui sera inclus au sein du laser 10 PW Apollon.Dans un premier temps nous présentons les spécificités des systèmes multi-pétawatts et l'intérêt de l'amplification OPCPA pour ce type de systèmes. Le choix du matériau amplificateur Yb:CaF2 pour le développement de la source de pompe OPCPA est alors justifié après exposition de ses caractéristiques. Nous concluons enfin le premier chapitre par le design préliminaire de la source de pompe, design adapté aux spécificités du cristal Yb:CaF2.Dans le deuxième chapitre nous commençons par étudier les effets de lentilles thermiques et de dépolarisation du milieu amplificateur sous forte puissance de pompe et en fonction de la polarisation ou de l'orientation cristalline. Cela permet de valider le choix de l'orientation [111] du cristal amplificateur pour les systèmes de forte puissance. Dans un second temps nous nous attardons sur les céramiques Yb:CaF2 car leur isotropie mécanique présente a priori un intérêt pour les systèmes de forte puissance. Nous étudions les céramiques fabriquées par voie humide et mettons en évidence un fort échauffement limitant leur utilisation. Plusieurs hypothèses quant à cet effet sont alors discutées.Dans le dernier chapitre, nous complétons le design de la pompe par des simulations d'absorption, de gain et d'extraction d'énergie. Nous exposons enfin les résultats expérimentaux obtenus en amplification pour les architectures régénérative et multipassage géométrique, utilisant des cristaux Yb:CaF2 en configuration miroir actif. / This PHD work is aiming at the development of a pump source for the nanosecond OPCPA of the 10 PW laser Apollon.First, we present the characteristics of the multipetawatt systems and the interest of OPCPA architecture for this type of systems. After detailing its characteristics, we then justify the choice of Yb:CaF2 as active media for the development of the nanosecond OPCPA pump source. We finally end the first chapter by the preliminary design of the pump source which is adapted to the specificities of the Yb:CaF2 crystal.The second chapter begins by the study of thermal lenses and thermal induced depolarization under high-power pumping in function of polarization or crystal orientation. The results allow us to validate the choice of [111] orientation for active media in the frame of high power laser systems. We then focus on ceramics because their mechanical isotropy appears to be interesting for high power systems. We study the ceramics made by wet route synthesis and highlight a strong heating, restricting their utilization. Several hypothesis are then investigated to explain this effect.In the last chapter we finished the design of the pump source with simulations of absorption, gain and energy extraction. We finally detailed the experimental results for two different architectures (regenerative and multipass), using Yb:CaF2 crystals in active mirror configuration.

A fiber amplifier is constructed at 1014.8nm and then frequency doubled to produce 507.4nm. This could then be frequency doubled again to produce 253.7 radiation. The fiber amplifier consists of Ytterbium doped double-clad fiber cooled to low temperatures and incorperates a diode laser as the seed source. The amplifier is built in a two stage configuration with high power diode lasers at 980nm pumping each stage. The output of the fiber amplifer is then doubled in a PPLN crystal and redoubled in a BBO cavity. Measurements are taken throughout the system to determine ouput powers from the first stage and from the fiber amplifier as a whole.

Thesis (Ph. D.)--University of Oregon, 2003. / Typescript. Includes vita and abstract. Includes bibliographical references (leaves 235-246). Also available for download via the World Wide Web; free to University of Oregon users.

A fiber amplifier is constructed at 1014.8nm and then frequency doubled to produce 507.4nm. This could then be frequency doubled again to produce 253.7 radiation. The fiber amplifier consists of Ytterbium doped double-clad fiber cooled to low temperatures and incorperates a diode laser as the seed source. The amplifier is built in a two stage configuration with high power diode lasers at 980nm pumping each stage. The output of the fiber amplifer is then doubled in a PPLN crystal and redoubled in a BBO cavity. Measurements are taken throughout the system to determine ouput powers from the first stage and from the fiber amplifier as a whole.

Zugl.: Hannover, Univ., Diss., 2008