The optical crystal α-Al2O3 has been widely used as the matrix of ruby and blue sapphire for its wide transparency, high
thermal conductivity, big scale and low cost. α-Al2O3 is so hard that cutter is easily abraded. Micromachining of α-Al2O3
by ultrashort pulsed laser is superior to the traditional mechanical approach as its non-contact and cold machining
features. However, unexpected cracks on the surface of α-Al2O3 are observed after femtosecond laser machining. In order
to hinder the crack source from stretching, we optimize the laser parameters accompanied with annealing. The crack-free
machining can be achieved. Three-dimensional α-Al2O3 microstructures free from fracture, such as cylinder, barrel and sphere are demonstrated.
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