Thermal, optical and spectroscopic characterizations of borate laser crystals

The Yb-content Li6Ln(BO3)3 (Ln: Gd, Y) solid solution has been investigated. Crystal growth has been successful for several compositions. A 22% molar content of ytterbium ions was determined by chemical analysis (ICP). Physical properties relevant to laser operation like mechanical hardness, thermal expansion and thermal conductivity were measured on single crystals. Optical measurements, including refractive index and low temperature spectroscopy, were also performed. Finally, the effect of the Y/Gd ratio is discussed.

Graphical abstractSeveral solid solutions of a rare earth borate were studied. The figure illustrates one of these single crystals obtained by Czochralski and shows thermal behaviour and absorption spectra at low temperature.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► We have grown by Czochralski method five Li6Ln(BO3)3 (Ln=Y, Gd,Yb) single crystals. ► Chemical, physical and spectroscopic characteristics are reported. ► Data relevant to laser operation are listed.