Abstract
Thermal stress can induce birefringence in a laser medium, which can cause depolarization of the laser. The depolarization effect will be very severe in a high-average-power laser. Because the depolarization will make the frequency doubling efficiency decline, it should be compensated. In this paper, the thermal characteristics of two kinds of materials are analyzed in respect of temperature, thermal deformation and thermal stress. The depolarization result from thermal stress was simulated. Depolarization on non-uniform pumping was also simulated, and the compensation method is discussed.
Highlights
Inertia fusion energy (IFE) is recognized as a clean energy
The requirement of repetition frequency is the prominent difference between ICF and IFE laser drivers
The depolarization result from thermal stress was simulated
Summary
The solid-state laser is one of the most competitive technical approaches for fusion energy drivers. IFE puts forward new and higher technology requirements for solid-state laser drivers, which are different from the inertial confinement fusion (IFC) laser driver. IFE includes the following main characteristics: high power, high repeat frequency/high efficiency and high reliability. These characteristics constitute the key advantages of the new generation of solid-state laser drivers. The requirement of repetition frequency is the prominent difference between ICF and IFE laser drivers. Yan has researched the energy storage characteristics of the two kinds of materials[6]. The thermal characteristics of these two kinds of materials are analyzed, in respect of temperature, thermal deformation and thermal stress.
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