On July 14th 2021 Jorge Omar Álvarez Pérez obtained his PhD degree from the Autonomous University of Madrid with the work entitled «Caracterización física y láser de monocristales de granates desordenados tipo Ca3(NbGa)5O12 dopados con Yb3+» (Physical and laser characterization of Ca3(NbGa)5O12 disordered single crystals doped with Yb3+). The work was awared with the «cum laude» maximum qualificatlon.
The work “A roadmap for laser optimization of Yb:Ca3(NbGa)5O12–CNGG–type single crystal garnet” published in Journal of Materials Chemistry C vol 9, pgs 4628-4642, 2021 https://pubs.rsc.org/en/Content/ArticleLanding/2021/TC/D0TC05718E#!divAbstract
completes a trilogy of new physical knowledge and laser performance progress of this disordered cubic crystal garnet with applications in ultrashort laser pulse oscillators.
Following the path of our original proposal of CNGG Na+ modification for charge compensation of Yb3+ doping, in a first work we introduced a crystallographic model to describe the Yb3+ optical bandwidth. In a second work we disclosed the presence of a small amount of Yb3+ in centrosymmetric octahedral position with dominant magnetic dipole transitions. In the present work we describe how to minimize the crystal coloration, the limits for Na incorporation and the relevant parameters helping for laser performance optimization.
Na and Li codoping of Yb:CNGG is found to provide the broadest tuning range along with best laser preformances.
In a recent work published in Journal of Materials Chemistry C 8, 2065, 2020 https://pubs.rsc.org/en/content/articlelanding/2020/tc/c9tc05910e#!divAbstract we show that a laser material with relatively low thermal conductivity can be grown with laser quality by the Laser Floating Zone growth technique using a CO2 laser as heat source for material melting.
The lack of any crucible to hold the material allows the melting of refractory compounds above 1500 ºC in oxidizing atmospheres. This suposses a great advantage for the devellopment of crystals for mode-locked laser producing ultrashort laser pulses.
This has been possible through the collaboration with the Aveiro University.
«Alternative luminescent excitation and material processing paths for brightness and stability optimization of near infrared nanoprobes with biophotonic applications» project has been recently awarded for the period 2019-2021, including economic support of a doctoral position.
Personnel of Pharmacy Faculty of Complutense University-Madrid, Iberian International Nanotechnology Laboratory-Braga, Center of Ultrafast & Ultraintense Pulsed Lasers-Salamanca, and Aveiro University play several different roles in the project activity.
The project aims the development of new luminescent and magnetic nanoprobes and their excitation with commercially available and specifically developed ultrashort (fs) laser pulses and magnetic fields.
«Lanthanide-based luminescence thermosensors: From bulk to nanoscale«, https://doi.org/10.1016/B978-0-12-813840-3.00010-7 , Chapter 10 in the book entitled «Lanthanide-based multifunctional materials. From OLEDs to SIMs» has been published by ELSEVIER and authored by REALM.