The laser at 1.342 μm wavelength from an all-solid-state single frequency Nd∶YVO4 laser was used to pump a frequency-doubler consisting of LBO crystal with type-I critical phase matching. Under the 1.14 W pump power, the second harmonic output of 580 mW is obtained with the double efficiency of 50.9%. The intensity fluctuation of the second harmonic wave at 0.671 μm is less than ±0.5% in 1 h and the laser frequency shift is better than ±2 MHz in 1 min under the condition of free running.