Abstract
We report efficient generation of tunable femtosecond pulses in the near IR using a two stage, white-light seeded, collinear, femtosecond optical parametric amplifier (OPA). The OPA, based on crystal in both stages and pumped at by a Ti:sapphire laser amplifier, provides sub- signal pulses after compression with energies exceeding , which corresponds to fivefold pulse shortening and internal conversion efficiency in the second stage considering pump pulses with energy. The corresponding idler pulses with more than have sub- duration without compression. The first stage alone is capable of producing sub- pulses near at the microjoule level without using any compression.
© 2009 Optical Society of America
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