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Academic literature on the topic 'Ions de thulium et d'holmium'
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Journal articles on the topic "Ions de thulium et d'holmium"
Guillemot, Lauren, Pavel Loiko, Alain Braud, Thomas Godin, Ammar Hideur, and Patrice Camy. "Les lasers thulium à 2300 NM : Avancées et perspectives." Photoniques, no. 109 (July 2021): 35–39. http://dx.doi.org/10.1051/photon/202110935.
Full textZmojda, Jacek Mariusz, Piotr Miluski, Agata Baranowska, Renata Jadach, and Marcin Kochanowicz. "Local Field Effect in antimony-germanate glasses co-doped with Rare-Earth ions and silver nanoparticles." Photonics Letters of Poland 9, no. 4 (December 31, 2017): 107. http://dx.doi.org/10.4302/plp.v9i4.791.
Full textImamaliyeva, Samira Zakir. "New Thallium Tellurides with Rare Earth Elements." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 22, no. 4 (December 15, 2020): 460–65. http://dx.doi.org/10.17308/kcmf.2020.22/3117.
Full textPafchek, R., J. Aniano, E. Snitzer, and G. H. Sigel. "Optical Absorption and Emission in Rare Earth Heavy Metal Fluoride Glasses." MRS Proceedings 172 (1989). http://dx.doi.org/10.1557/proc-172-347.
Full textDissertations / Theses on the topic "Ions de thulium et d'holmium"
Eremeev, Kirill. "Brοadband emitting materials dοped with thulium and hοlmium iοns fοr sοlid-state lasers at 2 μm and beyοnd." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC232.
Full textNovel laser-active inorganic materials doped with thulium and holmium ions have been investigated for their potential in broadly tunable and ultrafast lasers operating in the short-wave infrared spectral range of 2 to 3 μm. Lasers emitting within this spectral range find numerous applications, including light detection and ranging systems, gas sensing, medicine. They are used as amplifying systems for high harmonic generation and terahertz generation, and further frequency conversion into the mid-infrared region.The present PhD thesis establishes relationships between the structural properties of oxide and fluoride crystalline materials, in the form of single crystals and transparent ceramics, and the spectroscopic properties of thulium and holmium dopant ions, along with their laser characteristics, which are essential for laser development. Moreover, the physical processes underlying unexpected laser behaviour are revealed. This systematic study of laser materials allows for the identification of the most promising compositions for the development of broadly tunable and ultrashort pulse lasers.This study mainly focuses on materials that exhibit significant inhomogeneous spectral line broadening, resulting in broad and structureless absorption and emission spectra of the dopant ions. In order to promote this effect, several strategies have been considered, including rare-earth ion clustering, local structure disorder, compositional disorder in solid-solution compounds, and phonon-sidebands arising from electron-phonon interactions.The formation of thulium and holmium clusters in calcium fluoride crystals enables efficient and broadly tunable laser operation around 2.1 μm. A polarized spectroscopic study of the emission properties of holmium ions in disordered calcium rare-earth aluminate crystals sheds light on its broadband spectral properties and on the role of multiphonon assisted emission, which occurs beyond electronic transitions, in unexpected laser emissions observed in mode-locked lasers. In solid-solution sesquioxide ceramics of the yttria-lutetia-scandia ternary system doped with thulium ions, there is a strong and nearly linear variation of the crystal-field strength with the mean size of the host-forming cation. This relationship allows for the customization of both the position and width of the emission band above 2 μm by appropriately adjusting the host composition. Highly efficient laser operations of thulium- and holmium-doped sesquioxides around 2.1 μm and 2.3 μm have been demonstrated
Guéry, Claude. "Etudes spectroscopiques des ions thulium et holmium trivalents dans les verres de fluorures." Rennes 1, 1988. http://www.theses.fr/1988REN10064.
Full textGuery, Claude. "Etudes spectroscopiques des ions thulium et holmium trivalents dans les verres de fluorures." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37614067t.
Full textBoulma, El-Haine. "Etude des propriétés spectroscopiques des ions erbium et thulium trivalents dilués dans des cristaux de KY3F10." Reims, 2007. http://www.theses.fr/2007REIMS025.
Full textThe conversion of light towards high frequencies is carried out according to three excitation mechanism types: successive absorptions of several photons, the excited-state energy transfer between ions and the photons avalanche. This last process is a collective effect based on an energy transfer between an excited ion and an unexcited ion. Under certain conditions, these transfers can lead to a chain reaction inducing an important increase of anti-Stokes fluorescent intensity. The object of this work is the systematic study of the anti-Stokes fluorescence of the trivalent rare earth ions in the fluorite crystals. The studies, which we present, are recorded by using a monochromatic excitation around 650 nm provided by a tunable dye laser. I have studied more particularly the erbium and thulium diluted ions in the KY3F10 single crystals. This study permits to determine Starks sub-levels of the various 2S+LJ multiplets of Er3+ and Tm3+ ions at liquid nitrogen temperature with a very good precision. We expose also the results relating to the dynamics of anti-Stokes fluorescence, by analyzing the variation of the fluorescence intensity as a function of the excitation power and by taking measurements of lifetimes. We also report the results of a spectroscopic study of anti-Stokes emissions from a Tm3+-doped KY3F10 crystal demonstrating the sensitized effect of Er3+ ions, present as trace impurities, on the excited-state absorption lines of Tm3. In addition to Er3+ ion, the Ho3+ ion does not increase the possibilities of resonant transfer with the Tm3+ ion
Rubin, Jacques. "Etude de la dynamique des transferts d'énergie et des fluorescences dans un matériau laser à solide émettant dans l'infra-rouge le monocristal YLIF dopé aux ions terres rares erbium thulium et holmium /." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37609593r.
Full textGarnier, Nicolas. "Spectroscopie dans l'état excité des ions terres-rares Nd3+ et Tm3+ et fonctionnement laser multilongueur d'onde du YAG : Nd3+." Saint-Etienne, 1997. http://www.theses.fr/1997STET4020.
Full textBarthem, Ricardo Borges. "Mécanismes d'interaction et processus de transfert d'excitation optique entre ions terre rare dans CsCdBr3 et LiYF4." Grenoble 1, 1987. http://www.theses.fr/1987GRE10043.
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