Abstract
Mid-infrared coherent sources at 3-4 μm have a wide variety of applications that include, but are not limited to gas sensing, material processing and production control. The MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal is a well-known nonlinear element for quasi-phase-matched optical parametric oscillators (OPOs) typically pumped by 1-μm laser radiation [1]. However, strong multi-phonon absorption losses at wavelengths above 4 μm limit the use of MgO:PPLN for mid-IR OPO applications [2-4].
© 2017 IEEE
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