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Mid-IR femtosecond pulse generation on the microjoule level up to 5 μm at high repetition rates

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Abstract

We show efficient generation of mid-IR pulses tunable between 1 and 5μm from 100kHz class femtosecond systems. The concept can be applied to various sources, particularly based on Ti:sapphire and the newly evolving Yb+ 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 50fs are achieved.

© 2011 Optical Society of America

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