The utility model belongs to the laser instrument field, the glancing incidence lath amplifier who uses among concretely relates to diode pumped solid laser. The lath of this amplifier is by nd: the compound lath that YVO4 crystal and non - doping YVO4 crystal bonding formed, wherein, nd: the YVO4 crystal has the pumping face relative with the bonding face, non - doping YVO4 crystal has the cooling surface relative with the bonding face, the thermal current direction of cooling surface is the same with the pumping light direction of pumping face. The utility model discloses a lath is by nd: the compound lath that YVO4 crystal and non - doping YVO4 crystal bonding formed cools off through the face the same with the pumping orientation, can realize better heat pipe reason, reduces effect such as distortion and thermal lens before the laser wave that is caused by temperature gradient to improve the optical quality of output laser.