Advanced photon processing and measurement technology project was started from 1997 and high power allsolid-state lasers have been developed by FANUC and Toshiba aimed to realize finally the output power of more than 10 kW with the conversion efficiency of more than 20%, with the laser head volume of smaller than 0.05m3. So far, FANUC has obtained 3.3 kW output power with the optical efficiency of 35% using one slabtype Nd: YAG crystal. Toshiba has also obtained 3.3 kW output power with the same optical efficiency using rod-type Nd: YAG crystals. We present the detail of our development results and discuss the issue which may appear in applying high power all-solid-state laser in industries.
