研究目的
Investigating the factors affecting the quality of multi-focus cutting sapphire and the behavior of a multi-focal laser beam within bulk sapphire.
研究成果
The 2mm-thick sapphire was cut at a speed of 4 mm/s by laser multi-focus separation method and the roughness of cutting section is about 2.5 um, which provides an effective approach for processing high refractive index bulk materials.
研究不足
The interfacial spherical aberration due to the air/sapphire refractive-index mismatch was determined to be the most important factor limiting the cutting thickness of high refractive index materials.
1：Experimental Design and Method Selection:
The study involved optical simulations based on experimental results to analyze multi-focal laser beam propagation from air into sapphire.
2：Sample Selection and Data Sources:
Sapphire samples with a refractive index of
3：76 and > 80% 1064-nm transmittance were used. List of Experimental Equipment and Materials:
A 1064-nm picosecond laser system, a multi-focus head (HOMO Laser MF21-1064-25, China), and a Fresnel lens were used.
4：Experimental Procedures and Operational Workflow:
The sapphire was irradiated by the laser beam while moving at a velocity of 4 mm/s.
5：Data Analysis Methods:
Characteristics of the cutting section were investigated with a polarization microscope and a scanning electron microscope. The cut roughness was analyzed with a confocal laser scanning microscope.
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