Raman and absorption spectra and thermal conductance of Er:Yb:GdCa4O(BO3)3 crystals

Raman data and thermal expansion of Er:Yb:GdCa4O(BO3)3 (EYGCOB) crystals reveal that the crystal thermal conductance and thermomechanical properties are outstanding especially along the b direction. The Z-direction polarized absorbance of the b-direction wafer exhibits that the Yb3+ ion is very effectual as a sensitizer. These indicate that the EYGCOB crystals are suitable as an infrared radiation laser at about 1500 nm by using a pump wavelength of about 1000 nm from an InGaAs diode laser.