Efficient intracavity second-harmonic generation at 1063 nm in a GdCOB crystal

We report an efficient intracavity second-harmonic generation (SHG) at 1063 nm in a non-linear optical crystal, GdCa 4 O(BO 3 ) 3 (GdCOB), performed with a diode end pumped continuous-wave (CW) Nd:GdVO 4 laser. In the case of a laser with an a-cut 0.4 at % Nd:GdVO 4 crystal frequency-doubled with a GdCOB crystal cut for Type I frequency doubling. A CW SHG output power of 2.25 W has been obtained using a 15 mm long GCOB crystal. The optical conversion efficiency with respect to the incident pump power was 12.4%.