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- We developed LD pumped Nd:YVO4 microchip laser with the cavity length of 1㎜. The microchip laser output was 85.5㎽ at the wavelength of 1063.9㎚ with the input power of 241㎽ at the wavelength of 809㎚. The slope efficiency was 40.7% and the threshold input power was 31.1㎽. We have also defined input power limit for the single longitudinal mode operation theoretically. It was 2.5 times larger than that of threshold input intensity. According to the results of simulation, the Nd:YVO4 microchip laser can be operated with the maximum output of 15㎽ for the single longitudinal mode up to the input power of 77.75㎽.