TUBE GLASS CUTTING METHOD AND CUTTING DEVICE, AND TUBE GLASS PRODUCT MANUFACTURING METHOD

摘要

In this method for cutting a tube glass G1, the tube glass G1 is irradiated with a laser light L that is focused inside the tube glass G1, and an inner crack region C1 which includes one or multiple cracks is formed on a portion of the tube glass G1 in the circumferential direction thereof due to multiphoton absorption that occurs in the irradiation region of the laser light L, and stress is generated in the tube glass G1 to promote the cracks in the inner crack region C1 to develop in the circumferential direction of the tube glass G1 in order to develop the cracks throughout the entire circumference of the tube glass G1 and consequently cut the tube glass G1.