Transparent ceramics for high-energy laser systems

摘要

We demonstrate that transparent magnesium aluminate spinel ceramic possesses excellent thermo-opti-cal properties, a record low absorption loss of 6 ppm/cm, and superior ruggedness which position it as a prime candidate for an exit window aperture for high energy laser systems, especially in hostile environments. We also demonstrate lasing with an efficiency of about 45% in transparent Yb~(3+):Y_2O_3 ceramic made by hot pressing high purity submicron co-precipitated powder. This paves the way forward for high power solid state lasers exploiting hosts with higher thermal conductivity than YAG.