Abstract
Recently, there has been considerable interest in the nonlinear material ZnGeP2 because of its wide transparency range (0.74 ≤ λ ≤ 12.0 μm)1, its large nonlinear coefficient (50 ≤ d36≤ 110 pm/V),2-4 and its high surface-damage threshold (30 GW/cm2)5. These properties make it eminently suited for efficient parametric devices in the mid-IR spectral region, as well as for efficient second-harmonie generation (SHG). We employed the powerful (~1-MW) short pulses (~1 ps) of the Free Electron Laser for Infrared Experiments (FELIX) to study SHG in ZnGeP2 for mid-IR radiation over a wide wavelength interval.
© 1995 Optical Society of America
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