The output properties of an external resonator KGd(WO_4)_2 Raman laser pumped by nanosecond infrared pulses are studied.By changing the location of the KGd(WO_4)_2 crystal,Raman lasers with four wavelengths in the infrared region were generated including 1 159 nm,1 178 nm,1 272 nm and 1 317 nm.The obtained maximum output energies of the first Stokes pulses at 1 159 nm and 1 178 nm are 23.9 mJ and 19.2 mJ,respectively,and the corresponding conversion efficiencies are 34.8 % and 28 %,respectively.The obtained maximum output energies of the second Stokes pulses at 1 272 nm and 1 317 nm are 17.6 mJ and 15.2 mJ,respectively,and the corresponding conversion efficiencies are 28.1 % and 22.7 %,respectively.