An injection seeded Nd:YAG laser that incorporates an interference scheme to lock the frequency of a slave cavity mode to the seed frequency is described. On this basis, the method of compensating the retardation caused by the signal processing through deflecting polarizer is presented. This offers a new way for an injection seeded laser to improve the technique of locking the frequency of a slave cavity mode to the seed frequency, and the high quality output of the slave oscillator can be controlled simply and effectively.