Abstract

We report generation of broadly tunable (2.5–4 μm), narrow-band (0.04–0.35 cm⁻¹) pulsed infrared radiation through a nanosecond optical parametric amplifier based on potassium titanyl phosphate (KTP) pumped by the second harmonic of a 10-Hz Nd:YAG laser. Input radiation at signal wavelengths of 615–662 nm was derived from a pulsed tunable dye laser system. Advantages of this device are simplicity, the broad range of infrared wavelengths to which a single dye in the dye laser provides access, and conversion efficiencies > 10% at modest levels (< 150 μJ) of input radiation.

© 1996 Optical Society of America

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