A TRILOGY on Yb:CNGG lasers

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.