Abstract
Tape‐cast pseudo‐cubic zirconia pellets were surface irradiated by two coherent interfering high‐power short‐pulse Nd:YAG laser beams. The interfering beams of the third harmonic with a wavelength of 355 nm of a 2.5‐ns Q‐switched laser produced a line‐like intensity distribution with a periodic distance of 3.3 μm due to the selected angle between the beams. The resulting nonuniform surface heating produced a microstructure consisting of ultrafine‐grained zirconia with a grain size of about 10 nm within the top 100–200 nm depth of the treated surface region due to the high cooling rates during short‐pulse laser processing (up to 1010 K/s). The surface morphology closely followed the microperiodic heat treatment provided by the interfering laser beams. The pore size distribution within the periodic surface morphology ranged from a few nanometers to a maximum of half of the periodic line distances.
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