High-efficiency tunable dual-wavelength Cr:LiSAF laser with external grating feedback

A high-efficiency tunable all-solid-state dual-wavelength Cr:LiSAF laser is demonstrated. A V-folded main cavity combined with an external grating feedback was used to improve the efficiency and tunability. With one wavelength fixed at 862 nm, the other wavelength could be tuned from 840 nm to 882 nm. The output power in dual-wavelength operation mode reaches 195 mW with a pump power of 735 mW, indicating an optical-optical efficiency of 26.5%.