We demonstrate a new experimental approach for flexible femtosecond pulse generation in the mid-IR by use of difference-frequency generation from two tightly synchronized Ti:sapphire lasers. The resultant mid-IR pulse train can be easily tuned, with an adjustable repetition frequency up to 100 MHz, a pulse energy of ~1.5×10<sup>-13</sup> J, and an intensity noise similar to that of the Ti:sapphire. Rapid switching of the mid-IR wavelength and programmable amplitude modulation are achieved by precision setting of the time delay between two original pulses.
© 2003 Optical Society of America
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.7090) Lasers and laser optics : Ultrafast lasers
(320.0320) Ultrafast optics : Ultrafast optics
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
Seth M. Foreman, David J. Jones, and Jun Ye, "Flexible and rapidly configurable femtosecond pulse generation in the mid-IR," Opt. Lett. 28, 370-372 (2003)