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Ultrafast optical excitation with intense mid-infrared and terahertz pulseshas emerged as a new tool to control materials dynamically. As most experimentsare performed with femtosecond pulse excitation, typical lifetimes of mostlight-induced phenomena in solids are of only few picoseconds. Yet, manyscientific applications require longer drive pulses and lifetimes. Here, wedescribe a mid-infrared pump - terahertz-probe setup based on a CO$\mathrm{_2}$laser seeded with 10.6 $\mathrm{\mu}$m wavelength pulses from an opticalparametric amplifier, itself pumped by a Ti:Al$\mathrm{_2}$O$\mathrm{_3}$laser. The output of the seeded CO$\mathrm{_2}$ laser produces high powerpulses of nanosecond duration, which are synchronized to the femtosecond laser.Hence, these pulses can be tuned in pulse duration by slicing their front andback edges with semiconductor-plasma mirrors irradiated by replicas of thefemtosecond seed laser pulses. Variable pulse lengths from 5 ps to 1.3 ns areachieved, and used in mid-infrared pump, terahertz-probe experiments with probepulses generated and electro-optically sampled by the femtosecond laser.

Hybrid CO$\mathrm{_2}$-Ti:sapphire laser with tunable pulse duration for mid-infrared-pump terahertz-probe spectroscopy