KDP: large-sized crystals, easy to grow，with a high damage threshold and a large incident angle.
BBO: High conversion efficiency, wide temperature range available, high damage threshold
LBO: Large angle of incidence available, narrow matching frequency, and high damage threshold
But no matter what the characteristics of the above three nonlinear frequency doubling crystals are, currently only KBBF crystals can do it in the range of 200nm-150nm.