研究目的
Investigating the effect of numerical aperture on the mechanical strength of molten area in micro-welding of glass by picosecond pulsed laser.
研究成果
Superior focusing characteristics such as N.A. 0.65 enable a long region of high power density in beam axis, which can satisfy both high mechanical strength and high processing speed. The formation of continuous molten area by N.A. 0.65 is effective in improving the mechanical strength of weld line. Breaking stress can be increased by creating a large molten area of high density without crack.
研究不足
The study focused on the effect of numerical aperture on molten area characteristics but did not explore other potential influencing factors in depth. The preparation of specimens for pulling test was complicated to avoid the influence of optical contact force and friction.
1：Experimental Design and Method Selection:
The study employed a picosecond pulsed laser of 1064-nm wavelength and
2：5-ps pulse duration focused inside glass at high pulse repetition rate of 1 MHz by objective lenses of numerical apertures 45, 65, and 85 with spherical aberration correction. Sample Selection and Data Sources:
Borosilicate glasses (D263, Schott) were used as specimens.
3：List of Experimental Equipment and Materials:
Picosecond pulsed laser, objective lenses with different numerical apertures, borosilicate glass specimens.
4：Experimental Procedures and Operational Workflow:
Laser scribing process was carried out to divide the glass specimen into small size pieces. The laser was tightly focused at 250 μm below the top surface of glass specimen at
5：0-MHz pulse repetition rate and 100 mm/s scanning velocity. Data Analysis Methods:
The mechanical strength was evaluated by three-point bending test and pulling test. Molten areas were characterized by etching rate and Young’s modulus.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
