Theory and simulation of chirped pulse amplification

In order to compare the propagation characteristics of chirped-pulse propagating in homogeneously and inhomogeneously broadening mediums,they were analyzed and simulated by means of split-step Fourier method.Then they were proved in experiments.The effect of gain narrowing,gain saturation and self phase modulation on temporal shape and power spectra in both mediums were obtained.It is found that the effect of gain narrowing is more obvious and the effect of gain saturation is inhibited well in inhomogeneously broadening medium,and power spectra in both mediums are broadened,which is more symmetry in inhomogeneously broadening medium and distortive in homogeneously broadening medium.These results are useful to study the propagation features of chirped-pulse in comprehensive broadening mediums.