Abstract
We report efficient infrared conversion of picosecond, visible dye laser pulses and picosecond 1.064 μm by a sequence of difference frequency generations in LiIO 3 and AgGaS 2 crystals. The dye laser was a short cavity design and was pumped by the second harmonic of a mode-locked Nd: YAG laser to give 23 ps pulses. The design can span 4–11 μm in the infrared, and we tested the efficiencies between 5.2–6.4 μm with a single dye. Conversion efficiencies of the dye laser were 16%, while the resulting near infrared was converted to infrared at 35% efficiency.
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