The invention relates to a method for preparing
rare earth-doped
yttrium aluminum garnet transparent
ceramic. In the invention, high-transparency polycrystalline
ceramic is prepared by using commercial powdered Y2O3, Al2O3 and Re2O3, of which the purities are over 99.9 percent, as main raw materials and by
spray granulation dry pressing molding process and vacuum reaction and
sintering, wherein the Re may be one or several of trivalent
rare earth elements such as Nd<3+>, Yb<3+>, Cr<3+>, Er<3+>, Ce<3+>, Sm<3+> and Eu<3+>; MgO or CaO or
tetraethyl orthosilicate (TEOS) or SiO2 is used as a
sintering assistant; a certain amount of bonding agent,
plasticizer and dispersant is added; the oxides,
sintering assistant and additive are mixed and added into a
liquid medium, and the mixture is ball-milled and mixed for 0.5 to 100 hours; after the
powder materials are mixed uniformly, the
powder is made into spherical or approximately spherical grains; blanks formed by
drying pressing isostatic forming are degreased; sintering the blanks in a
vacuum sintering furnace; and annealing after sintering. The transmissivity at a
laser wavelength of the
rare earth-doped
yttrium aluminum garnet transparent
ceramic prepared by the method is more than or equal to 77 percent.