We present a widely tunable mid infrared coherent light source based on a tandem optical parametric oscillator (OPO)
and subsequent optical parametric amplification (OPA). The output wavelengths can be seamlessly tuned in the Mid-IR
from 2.6 μm to 12 μm or 4000 cm-1 to 833 cm-1 respectively. Maximal output energy of 26 mJ was obtained at a wavelength of 4.25 μm.