Abstract

Subpicosecond synchronization between a mirror-dispersion-controlled 10-fs Ti:sapphire laser and the Free-Electron Laser for Infrared Experiments has been achieved. The measured intensity cross correlation between the two lasers is consistent with a jitter of only 400 fs rms. The wide and continuous tunability of the free-electron laser (FEL; 4.2300 µm) combined with ultrashort pulse duration of six optical cycles and high pulse energy of several tens of microjoules makes a series of two-color experiments possible in a previously inaccessible wavelength range. We demonstrate these capabilities by performing a two-color pump–probe experiment to study carrier cooling in GaAs. A FEL tuned from 8 to 17 µm is used as the pump, and a synchronized Ti:sapphire laser pulse serves as the probe.

© 1998 Optical Society of America

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