J. Phys. IV France 01 (1991) C7-335-C7-338
UPCONVERSION SPECTROSCOPY OF ERBIUM DOPED FLUORIDE CRYSTALSJ.P. JOUART and G. MARY
GRSM, Laboratoire d'Energétique et d'Optique, Université de Reims, F-51062 Reims cedex, France
We study the red-to-green upconversion in Er3+ doped fluoride crystals. We show that the dominant upconversion process depends on the excitation wavelength : a two-step absorption between 631 and 634 nm and a two-ion interaction between 641 and 647 nm for an Er3+ doped cadmium fluoride at 77 K. An efficient IR (803 nm)-to-green upconversion via three-step absorption is also reported, for the fist time, in Er3+ doped strontium fluoride at 300 K. A selection of sites exhibiting two or three transitions which energetically coincide with an appropriate laser excitation wavelength could optimize the upconversion efficiencies.
© EDP Sciences 1991