Cutting the closed curve shape inside glass with laser induced thermal-crack propagation

This work lays great emphasis on studying the technique of the laser cutting the closed curve shape inside glass with laser induced thermal-crack propagation. The conventional LITP cutting is unable to complete a closed curve. The reason and the crack propagation behavior are studied by the extended finite element method (XFEM) analysis and experiments. In order to achieve the closed curve shape inside glass, the stress-release crack is proposed for the first time. The stressrelease crack-tip with 90° and 1.5mm is the suitable arrange. This paper indicates the experiment of the LITP cutting the closed outer curve shape with the stress-release crack. Optical microscope photographs of the crack surface are obtained to examine the cutting quality. This work provides a method to cut the closed curve shape inside glass with LITP successfully