Compensation of nonlinear phase shifts with third-order dispersion: fiber stretchers can out-perform grating stretchers in short-pulse fiber amplifiers

TL;DR

This paper demonstrates that nonlinear phase shifts can be effectively compensated by third-order dispersion in short-pulse fiber amplifiers, showing fiber stretchers can outperform grating stretchers especially at high pulse energies.

Contribution

It introduces a method to compensate nonlinear phase shifts with third-order dispersion, challenging the belief that grating stretchers are superior in fiber amplifiers.

Findings

Nonlinear phase shifts can be compensated by third-order dispersion.

Fiber stretchers can outperform grating stretchers in certain conditions.

Optimal nonlinear phase shift improves pulse duration and peak power.

Abstract

We show that nonlinear phase shifts and third-order dispersion can compensate each other in short-pulse fiber amplifiers. In particular, we consider chirped-pulse fiber amplifiers at wavelengths for which the fiber dispersion is normal. The nonlinear phase shift accumulated in the amplifier can be compensated by the third-order dispersion of the combination of a fiber stretcher and grating compressor. A numerical model is used to predict the compensation, and initial experimental results that exhibit the main features of the calculations are presented. In the presence of third-order dispersion, an optimal nonlinear phase shift reduces the pulse duration, and enhances the peak power and pulse contrast compared to the pulse produced in linear propagation. Contrary to common belief, fiber stretchers can perform as well or better than grating stretchers in fiber amplifiers, while offering the major practical advantages of a waveguide medium. The relative benefits of a fiber stretcher increase with increasing pulse energy, so the results presented here will be relevant to fiber amplifiers designed for the highest pulse energies.