Lasing properties of new Yb-doped borate compounds with varying gadolinium and yttrium concentration

摘要

We show spectroscopic and lasing properties of new ytterbium-doped borate compounds with the structure Li_6(Gd_((l-x))Y_x)_(0.75)Yb_(0.25)(BO_3)_3 with x = 0, 0.25, 0.5, 0.75 and 1, respectively. All compounds show large emission spectra suitable for femtosecond pulse generation. We studied the laser performances in a diode-pumped linear laser cavity on about 1mm-thick crystal samples having an ytterbium doping concentration of 22 %. The compounds show all cw lasing at wavelengths around 1040 to 1060 nm with a slope efficiency of 32 %. The maximum observed output power was 460 mW at an incident pump power of 1.6 W at 972 nm.