End-pumped by a Ti:sapphire laser at 871 nm, quasi-cw laser around 1060 nm with power up to 395 mW and slope efficiency near to 52% has been obtained from a Nd3+:LaB3O6 cleavage microchip placed in a plano-plano resonator. The influence of the ratio between the cavity mode and pump beam area on the laser performances and laser spectra at various output powers have been investigated. The experimental results show that the cleavage technique may be a novel method to obtain the microchip laser medium easily and directly.