Efficient second-harmonic generation of ND:YAG laser in CsB3O5 crystal

We have demonstrated efficient second-harmonic generation (SHG) of high energy fundamental Nd:YAG laser pulse energy of the multi-joule (J) level at a high repetition rate using high optical quality top-seeded solution growth CsB3O5(TSSG-CBO) crystal. SHG (532 nm) output energy of 1.2 J at 10 Hz is obtained with a conversion efficiency of 60%. This result has been obtained at the multi-J level by the growth of high optical quality TSSG-CBO crystal with the large effective nonlinear coefficient and high damage threshold. These results indicate that TSSG-CBO is a good candidate material for high energy SHG of Nd-doped lasers at the several J level or more with high repetition rate. (author)