SECONDMENT

France_Canada

DEVELOPMENT OF A NEW GENERATION OF TRANSPARENT GLASSES OVER A LARGE WINDOW OF TRANSPARENCY


FROM : UNIVERSITÉ DE BORDEAUX (FRANCE)TO : UNIVERSITÉ LAVAL (QUÉBEC)

FROM : 1 SEPTEMBER 2021 TO :  1 SEPTEMBER 2022

Involved Work Packages :

WP2


RESEARCHER

Samar AOUJI

PhD Student
Université de Bordeaux (ICMCB)

OBJECTIVES

During a first manipulation at the ICMCB « Chemistry and Photonics of Oxide and Fluoride Materials » team (focusing on the study of heavy oxide materials), I tried to develop a new generation of transparent glasses over a large window of transparency ranging from visible to mid-infrared (up to 5 µm). This work includes the definition of compositions, the shaping of materials under fiber and their study. This work will continue in COPL and more. Working on different techniques and methode to synthetise glasses with good proprietes, that could be used as a fiber.

Transmission at long wavelengths in glasses is limited by the multiphonon absorption of the material. The heavier the elements, the lower the phonon energy, and therefore the more the multiphonon cutoff is pushed back into the infrared. The germanate and gallate glass matrices allow the transmission window of materials to be extended up to the IR medium at 5µm, which extends the field of use for applications of chemical sensors for example. The Franco-Quebec consortium recently demonstrated during the thesis co-supervision of Téa Skopak (thesis between the ICMCB and the COPL defended in 2017) and the ANR PRCI Proteus (2017-2021) that the introduction of ions rare earth such as lanthanum or yttrium opened a wide window of composition for fiberizing by preform. The purification problems will be solved by developing complete production lines and syntheses under controlled atmosphere. Particular attention will be paid to the purification of these germanate and gallate materials and in particular the elimination of the hydroxyl groups.

TASKS

  • Synthesis of new compositions of heavy oxide glasses and purification of materials Material fiber for infrared and mid infrared
  • Physicochemical and structural characterizations (Raman, NMR, luminescence, AFM, Electron microscopies: SEM, TEM, EDS, Auger)
  • Mechanical and optical characterization of fibers

RESULTS