Theoretical optimization of nonlinear chirped-pulse fiber amplifiers

Abstract

The exploitation of nonlinear phase shifts $\left({\Phi }^{NL}\right)$ in chirped-pulse fiber amplifiers has been demonstrated recently. Systematic optimization of the performance of a femtosecond-pulse fiber amplifier in the presence of substantial ${\Phi }^{NL}$ is a challenging multivariable problem. We introduce an approximate theoretical model that is valid as long as the ${\Phi }^{NL}$ is not so large that the spectrum changes substantially. The model allows an arbitrary chirped-pulse amplification system to be described by a set of four universal curves. These reveal the scaling of performance and allow determination of the optimal values of residual group-velocity dispersion and third-order dispersion for a given pulse duration and energy.

© 2007 Optical Society of America

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