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This paper describes a new method to design a laser mirror with high reflectivity, wide reflection bandwidth and high laser-induced damage threshold. The mirror is constructed by three materials of HfO2/TiO2/SiO2 based on electric field and temperature field distribution characteristics of all-dielectric laser high reflector. TiO2/SiO2 stacks act as the high reflector (HR) and broaden the reflection bandwidth, while HfO2/SiO2 stacks are used for increasing the laser resistance. The HfO2/TiO2/SiO2 laser mirror with 34 layers is fabricated by a novel remote plasma sputtering deposition. The damage threshold of zero damage probability for the new mirror is up to 39.6 J/cm2 (1064 nm, 12 ns). The possible laser damage mechanism of the mirror is discussed.
The paper describes a new method to design a laser mirror with high reflectivity, wide reflection bandwidth and high laser-induced damage threshold. The mirror is constructed by three materials of HfO2 / TiO2 / SiO2 based on electric field and temperature field distribution characteristics of all -dielectric laser high reflector. TiO2 / SiO2 stacks act as the high reflector (HR) and broaden the reflection bandwidth, while HfO2 / SiO2 stacks are used for increasing the laser resistance. The HfO2 / TiO2 / SiO2 laser mirror with 34 layers is fabricated The damage threshold of zero damage probability for the new mirror is up to 39.6 J / cm2 (1064 nm, 12 ns). The possible laser damage mechanism of the mirror is discussed.