Abstract
We show efficient generation of mid-IR pulses tunable between 1 and from class femtosecond systems. The concept can be applied to various sources, particularly based on Ti:sapphire and the newly evolving lasers. The mid-IR pulses are generated as the idler of a collinear optical parametric amplifier pumped by the laser fundamental. The seed for this amplifier is the idler of a previous amplification stage pumped with the second harmonic and seeded with a visible continuum. This enhances the energy and allows us to influence the bandwidth of the final output. Pulses with microjoule energy and Fourier limits of are achieved.
© 2011 Optical Society of America
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