.:Georges Boulon:. Université-Claude Bernard Lyon1 | Page personnelle

Topics

 

*Programs of research: Highlights

1. Heavy ions: d10 s2 configuration, Bi3+ and Pb2+ mercury-type ions

1.1. Spectroscopy and Excited state dynamics of Bi3+-doped oxide materials

1.2. Spectroscopy and Excited state dynamics of Pb2+-doped apatites

 

2. Transition metal ions: 3dn configuration

2.1. Deep program on Cr3+ -doped crystals/glasses

-Nucleation in Cr3+ ions-doped oxide glasses

-Cr3+ as a probe ion in garnets, magnetoplumbites, spinels, niobates

-Fano effect between 2E and 4T2 levels

-Model of Cr3+ multisites . Application to (Ca,Zr)GGG garnets

-Effect of cation invertion in garnets on Cr3+ spectroscopy

-Four-Wave mixing technique applied to energy transfer of Cr3+ ions in garnets

-Laser spectroscopy of Cr3+-doped nonlinear niobate crystals, especially of stoichiometric and congruent LiNbO3

2.2. Other transition metal ions

-Ti3+,4+; Cr3+,4+,5+,6+; Mn2+,3+,4+; Ni2+; Co2+; V2+,3+, spectroscopies

3. Rare earth ions: 4fn configuration: Ce3+, Nd3+, Ho3+, Er3+, Tm3+, Yb3+

3.1. Deep program on Yb3+-doped Laser materials

- Yb3+-doped cubic laser crystals:

Y3Al5O12 (YAG), Gd3Ga5O12 (GGG), Lu3Al5O12 (LuAG), (Ca,Zr)GGG Garnets,

Y2O3, Sc2O3, Gd2O3, Lu2O3 sesquioxides,

MgAl2O4, ZnAl2O4 spinels,

KY3F10, CaF2 fluorides

- Yb3+- doped non cubic laser crystals

YAP perovskite,

KY(WO4)2, KGd(WO4)2 monoclinic tungstates

Apatites: a few compositions by µ-PD  and Ca8La2(PO4)6O2 by CZ

- Yb3+- laser silicate glasses

 

Actually:

- Yb3+- doped laser ceramics

Main advances on Yb3+ and other rare earth ions-doped laser materials: Figure-of-Merit, energy transfers, avalanche and looping mechanisms, concentration quenching mechanisms, gain model, optimization of laser, segregation of rare earth ions in ceramics

3.2. Phosphors for white lighting

Ce3+/Eu2+/Eu3+-doped silicate glass phosphor and UV/blue LEDs as circadian response for white lighting.

Mis à jour le: 22/11/2017