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Microjoule-energy, 1 MHz repetition rate pulses from all-fiber-integrated nonlinear chirped-pulse amplifier

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Abstract

We demonstrate generation of pulses with up to 4μJ energy at 1MHz repetition rate through nonlinear chirped-pulse amplification in an entirely fiber-integrated amplifier, seeded by a fiber oscillator. The peak power and the estimated nonlinear phase shift of the amplified pulses are as much as 57kW and 22π, respectively. The shortest compressed pulse duration of 140fs is obtained for 3.1μJ of uncompressed amplifier output energy at 18π of nonlinear phase shift. At 4μJ of energy, the nonlinear phase shift is 22π and compression leads to 170-fs-long pulses. Numerical simulations are utilized to model the experiments and identify the limitations. Amplification is ultimately limited by the onset of Raman amplification of the longer edge of the spectrum with an uncompressible phase profile.

© 2010 Optical Society of America

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