Two 808 nm semiconductor lasers were combined by V-shaped spectral beam combining and locked at 795.8 nm and 800.5 nm respectively. The output power and beam quality in the slow axis were improved significantly. The sum frequency of semiconductor lasers was realized based on the laser source. A laser with an output power of 6.5 W and beam quality of M²=2.2×18.5 was obtained by the spectral beam combining. The M² in slow axis was improved by 30% and the combining efficiency was 83%. The sum frequency laser with 401.0 nm at a power of 18.3 mW was obtained and the efficiency of sum frequency generation was 0.28%.