Sum frequency generation of semiconductor laser based on V-shaped spectral beam combining

Two 808 nm semiconductor lasers were combined by V-shaped spectral beam combining and locked at 798.8 nm, and 800.5 nm respectively. The outpower 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 399.9nm sum frequency laser at a power of 18.3mW was obtained and the efficiency of sum frequency generation was 0.28%.