Yb:CaGdAlO4(called CALGO) is a promising new laser gain material which possess several important advantages. The crystal structure of CALGO is tetragonal. When it is pumped at 979nm under pi configuration, we can get broad emission spectra from 994nm to 1050nm in theta configuration. This implies a very small quantum defect (down to 1.5%) and gives a good expectation of obtaining ultra-short pulse. Its thermal conductivity is also high: k=6.7W/m/K, which means it can be used for high power laser applications.

Cesium Lithium Borate (CsLiB6O10，CLBO) is a newly developed crystal with excellent UV nonlinear feature，and widely used for semiconductor inspection，micro processing，bio-medical，UV-LIDAR，etc. Compared to BBO，it has larger spectral and temperature acceptance，larger angle tolerance and smaller walk-off angle (see Table 1). These advantages make CLBO obtain larger SHG conversion efficiencies than BBO. Moreover，it is suitable for FOHG and FHG of high-power Nd:YAG laser.