Abstract
An all solid state tunable I.R. laser source is described. A Q-switch Nd:YAG laser at 1.064 µm is used to pump two optical parametric oscillators (O.P.O.) in series. The first O.P.O. uses a LiNbO3 crystal and works in the vicinity of degeneracy. Its signal beam (adjusted at 1.82 µm) is used as a pump for the second O.P.O. which uses an AgGaSe2 crystal and covers the range from 2.6 µm to 6 µm. The conversion efficiency between the energy produced by this O.P.O. in the signal and idler beams (λs=2.6 µm; λj=6 µm) and the input energy at 1.064 µm is 1.75%.
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