We demonstrate a novel traveling-wave-type optical parametric generator based on 1.25-µm pumping of HgGa<sub>2</sub>S<sub>4</sub> that produces tunable, high-power, transform-limited ∞ 200-fs pulses in the mid-IR from 5 to 9 µm. Output idler energies on the microjoule level are obtained with maximum conversion efficiency of 11% for the amplifier stage, which is more than two times better than the results obtained with an analogous sample of the widely spread material AgGaS<sub>2</sub>.
© 2000 Optical Society of America
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4970) Nonlinear optics : Parametric oscillators and amplifiers
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
F. Rotermund and V. Petrov, "Mercury thiogallate mid-infrared femtosecond optical parametric generator pumped at 1.25 µm by a Cr:forsterite regenerative amplifier," Opt. Lett. 25, 746-748 (2000)