Fig. 1. Schematic of the experiment setup

Fig. 2. (a) Schematic of the layout of optical contact area and the welding seam on glass; (b) schematic of the welding tensile strength test of glass

Fig. 3. Cross section of the fused silica welding seam with different laser parameters, the experimental parameter is (a) f=500 kHz, P=3.00 W; (b) f=500 kHz, P=4.14 W; (c) f=500 kHz, P=4.46 W; (d) f=500 kHz, P=5.10 W; (e) f=175 kHz, P=4.14 W; (f) f=1000 kHz, P=4.14 W; (g) f=2000 kHz, P=4.14 W

Fig. 4. (a) Microgram of the fused silica welding seam, the welding parameters are f=500 kHz, P=3.00 W, v=20 mm/s (v is scanning speed); (b) welding surface view of fused silica, the welding parameters are f=2 MHz, P=4.14 W, v=20 mm/s

Fig. 5. Morphologies of the interface after the crack of the welding sample, the welding parameters are P=4.46 W, f=500 kHz, v=20 mm/s. (a) Upper glass interface bulges; (b) the lower glass interface pits

Fig. 6. Measurements of glass welding stresss. (a) NA=0.67, v=20 mm/s, f=500 kHz; (b) NA=0.67, v=20 mm/s, P=4.14 W

Fig. 7. Cross section of glass welding seam. (a) Aluminosilicate glass (f=500 kHz, P=1.28 W, v=20 mm/s, NA=0.67); (b) soda-lime glass (f=500 kHz, P=1.51 W, v=20 mm/s, NA=0.67)