Generation of ultra-broadband pulses in the near-IR by non-collinear optical parametric amplification in potassium titanyl phosphate.

Non-collinear optical parametric amplification in potassium-titanyl phosphate (KTP) pumped with 800 nm pulses is reported. Broadband phase matching is achieved with non-collinear geometry and a slightly divergent signal seed. This enables a gain bandwidth up to approximately 2500 cm(-1) in near-IR region. Introducing a chirp into the pump pulse makes it possible to amplify the white light seed in a broad spectral region from approximately 1050 to approximately 1400 nm simultaneously. Pulse compression to sub-40 fs is readily achieved, while the spectrum should support approximately 8.5 fs pulses. Angular dispersion of the broadband output is discussed.