Ultrabroadband mid IR pulses with energy as high as $2\mu \mathrm{J}$ and tunability from $2\text{to}5\mu \mathrm{m}$ are generated as the idler beam of an $800\mathrm{nm}$ pumped optical parametric amplifier in periodically poled stoichiometric lithium tantalate. After bulk compression in a Ge plate and frequency-resolved-opticle-gating characterization, a pulse duration as low as $25\mathrm{fs}$ was measured, corresponding to two optical cycles of the $3.6\mu \mathrm{m}$ carrier wavelength.

© 2008 Optical Society of America

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