Abstract

A tunable IR laser source is described. A Q-switched Nd:YAG laser at 1.064 μm is used to pump two optical parametric oscillators (OPO's) in series. The first OPO uses a LiNbO₃ crystal and works in the vicinity of degeneracy. Its signal beam (adjusted to 1.82 μm) is used to pump the second OPO, which uses a AgGaSe₂ crystal and covers the range 2.6–6 μm. The conversion efficiency between the energy produced by this OPO in the signal and idler beams (λ_s = 2.6 μm and λ_i = 6 μm, respectively) and the input energy at 1.064 μm is 1.75%.

© 1994 Optical Society of America

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