Theoretical analysis of an end-pumped Yb:YAG active mirror thin-disk amplifier with a longitudinal doping concentration gradient

摘要

In this paper, we present a theoretical derivation of the amplification in a longitudinally pumped amplifier with a doping gradient concentration optimized for obtaining a constant longitudinal gain. This technique makes it possible to reduce both the effect of the amplification of the spontaneous emission (ASE) and the temperature gradient. We will express the longitudinal concentration profile as a function of the amplifier parameters and the launched pump intensity. Our computations show the limits of such a technique for controlling the ASE. We will also make a proposal for a technique to achieve such a controlled concentration profile.