Numerical investigation on the spectral and temporal characteristics of amplified spontaneous emission in chirped pulse regenerative amplifiers

摘要

Accurate characterization of the amplified spontaneous emission (ASE) is greatly important for designing a high-contrast chirped pulse amplifier (CPA). In this paper, we develop a theoretical model based on small signal gain calculation (SSGC) to simulate the temporal and spectral profiles of the ASE output power of a chirped pulse regenerative amplifier. Also, the finite difference time domain (FDTD) is utilized as a robust mathematical method to describe ASE characteristics. Comparison of the two methods introduces the developed SSGC as a fast, greatly efficient and accurate technique to predict and analyze the ASE behavior in a CPA system.