High-power difference-frequency generation at 4.4-5.7 µm in LiIO3

Efficient generation of high-power difference-frequency radiation, continuously tunable over the range of
4.4-5.7 \mu
m, has been achieved by mixing the Nd :YAG laser and Nd :YAG pumped infrared dye-laser outputs in LiIO
3
. Peak pulse powers as high as 550 kW with an average power output of 45 mW were obtained around 4.9μm.