Ion doping in single crystal using healing effect

裂纹愈合是固体中原子在退火过程中靠近固体表面移动而使裂纹恢复的现象。飞秒激光具有超短脉冲宽度，可以在固体内部形成裂纹而不产生热损伤。本文利用飞秒激光在蓝宝石晶体内部引入裂纹，并尝试通过修复效果掺杂金属离子。结果表明，在1300℃这一韧脆转变温度下，裂纹的愈合速度加快。此外，还发现金属离子Ti、Cr和Co沿激光照射形成的裂纹扩散。

Crack healing is the phenomenon that cracks in solids recover by moving of atoms near solid surface with annealing. Femtosecond laser has a ultrashort pulse width and it is possible to form cracks inside solids without heat damage. Here, we introduced cracks inside sapphire crystal using femtosecond laser and tried to metal ion doping via healing effect.It was revealed that the crack healing promoted over 1300C, which is ductile-brittle transition temperature. In addition, it was also revealed that metal ion, Ti, Cr, and Co, diffused along cracks formed by laser irradiation.