2方向レーザ照射によるガラス内部での金属球の分裂

抄録

The authors have reported the laser-induced metal sphere migration in the glass. The metal sphere migrated toward the light source along the optical axis. In this paper, we describe the metal sphere separation by two laser beam illumination from the opposite direction. A stainless-steel sphere in borosilicate glass was heated by two continuous-wave green laser illumination. The laser beam diameter influenced the separation result. One metal sphere was separated to two spheres, when the beam diameter was 60 and 80 µm. When the beam diameter was 100 µm, the one metal sphere was not separated and maintained the shape and migrated toward one direction. When the beam diameter was 20 and 40 µm, laser illumination separate two small sphere from the metal sphere and one metal sphere was left. Hence the one metal sphere separated to three metal spheres. In-situ observation with a high-speed camera and numeral temperature calculation clarified the separation process. Finally, the size control of the metal sphere was demonstrated by changing the beam diameter.