We demonstrate the removal of 2π radians of self-phase modulation (SPM) in a fiber-based chirped pulse amplification (CPA) system. Compensation of SPM distortion is achieved in the time domain by using a LiNbO3 electro-optic phase modulator to emulate a negative nonlinear index of refraction. By synthesizing the drive waveform to the phase modulators with two RF frequencies that are phase-locked to the repetition rate of the seed laser, we achieve large phase compensations using cost-effective narrow band electronics. Our technique is simple, robust and can be readily integrated into existing fiber CPA systems.
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