Modification characteristics of filamentary traces induced by loosely focused picosecond laser in sapphire |
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| Affiliation: | 1. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Max-Born-Straße 2A, D-12489 Berlin, Germany;2. BAM Bundesanstalt für Materialforschung und–prüfung, Unter den Eichen 87, D-12205 Berlin, Germany;1. Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2. State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China,;3. Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, 6129 Etcheverry Hall, Berkeley, CA 94720-1740, USA;4. Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA;1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2. Physics Department, Shanghai University, Shanghai 200444, China;3. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;4. Key Laboratory of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | The ability of loosely focused picosecond laser to induce filamentation (4.8 times the Rayleigh length) in sapphire was confirmed. The morphology and microstructure of the filamentary traces under typical pulse energy were studied, in which the colorful birefringence phenomenon and damage defects were detected in sapphire. Irreversible ceramic-like polycrystalline microstructures were formed in filamentary traces, and the phase transition from α-Al2O3 to γ-Al2O3 directly reflected the thermal effect of picosecond laser filamentation. According to the filamentary characteristics, a continuous filamentary channel with a uniform diameter of 33 μm and a length of 7443 μm was obtained by gradually raising the focal position. The research provides first-hand information for the high throughput micro-cutting, micro drilling and thin slicing of sapphire based on ultrafast laser non-linear effects. |
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| Keywords: | Picosecond laser Filamentation Sapphire Modification Phase transition |
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