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Broadband femtosecond parametric amplification in KTA close to mid-IR transparency cutoff

We report an increase in conversion efficiency and significant broadening of signal and idler bandwidth in the collinear KTA optical parametric amplifier operating close to mid-IR transparency cutoff (5.2 μm) for a visible and near IR pump. Using a 1.24 μm pump we have produced 2 μJ idler pulses at 3.8 μm central wavelength with a bandwidth supporting 65 fs transform limited duration. Further tuning to mid-IR up to 5 μm could be achieved with a 620 nm pump.