Download or read book Doubleurs de fr quences en optique int gr e utilisant des polym res et des nano r seaux de diffraction written by Gerd Blau and published by . This book was released on 1996 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE DE THESE PRESENTE UNE ETUDE THEORIQUE ET EXPERIMENTALE CONCERNANT UNE CONFIGURATION ORIGINALE DE GENERATION DE SECOND HARMONIQUE. LA CARACTERISTIQUE ESSENTIELLE DE CE GENERATEUR, REALISE EN OPTIQUE INTEGREE, EST CONSTITUEE PAR LA PRESENCE D'UN NANO-RESEAU DE DIFFRACTION (PERIODES DE 160 NM A 500 NM). LE RESEAU EST RECOUVERT D'UNE COUCHE MINCE DE POLYMERE (PNA-PMMA) QUI PRESENTE UNE FORTE NON-LINEARITE D'ORDRE DEUX. LA TRES FAIBLE PERIODE DE CE RESEAU AUTORISE UN NOUVEAU TYPE D'ACCORD DE PHASE, APPELE CONTRAPROPAGATIF, OU LE MODE DE POMPE ET LE MODE GENERE A LA FREQUENCE DOUBLE SE PROPAGENT EN SENS OPPOSES. NOUS AVONS DEVELOPPE UN FORMALISME BASE SUR UNE COMBINAISON DE LA METHODE DIFFERENTIELLE ET LA THEORIE MODALE. CE FORMALISME NOUS A PERMIS D'OPTIMISER LE DISPOSITIF EN EFFICACITE DE CONVERSION PAR UNE SIMULATION NUMERIQUE. NOUS PRESENTONS LA PREMIERE REALISATION EXPERIMENTALE METTANT EN JEU CET ACCORD DE PHASE CONTRAPROPAGATIF UTILISANT UN RESEAU D'UN PAS DE D = 160 NM OU NI LE MODE DE POMPE, NI LE MODE GENERE NE SONT DECOUPLES. L'EFFICACITE DE CONVERSION EST LIMITEE PAR LES PERTES PAR DIFFUSION DES COUCHES HAUT INDICE (TA#2O#5) ET PAR LA LARGEUR SPECTRALE DU LASER DE POMPE. PAR AILLEURS, NOUS AVONS OBTENU UNE EFFICACITE DE CONVERSION PROMETTEUSE (5.8*10#-#6 1/W) EN UTILISANT UN RESEAU DE PAS 320 NM OU LE MODE GENERE EST DECOUPLE DANS UN ORDRE DIFFRACTE RAYONNE A LA FREQUENCE DOUBLE. L'ACCORD DE PHASE A ETE REALISE DANS CE CAS EN UTILISANT LA DISPERSION CHROMATIQUE DES MODES

Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

Download or read book Laser 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.