Dynamics of laser-induced plasma ejection which is generated in bulk glass and its application

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06004
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Chiba University
• Principal Investigator: Hidai Hirofumi 千葉大学, 大学院工学研究院, 教授 (60313334)
• Co-Investigator(Kenkyū-buntansha): 森田 昇 千葉大学, 大学院工学研究院, 教授 (30239660) ; 松坂 壮太 千葉大学, 大学院工学研究院, 准教授 (30334171)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: レーザ

Outline of Final Research Achievements

Glass can absorb a high power laser beam and cause the fiber fuse phenomenon, due to high temperatures. When a high power laser is transmitted into a bulk glass, absorbent on the glass absorbs the laser and is heated; the glass in the vicinity is heated by the thermal conduction, sufficient to form plasma in the fiber. The plasma propagated toward the light source and ejected when the plasma reached the glass surface.
Plasma ejection formed glass fiber with nanoparticle. Blanched plasma was formed by illumination of the two laser beams and blanched hole was formed.

Free Research Field

精密加工

Academic Significance and Societal Importance of the Research Achievements

レーザ照射によりガラス内部に形成した高温の領域が形成する．この高温の領域をガラス表面に導くと，爆発的に飛散し，急冷される．急冷されたガラスは，ファイバの上に微粒子が付着した形状をしている．また，噴出した跡は穴となる．この高温の噴出のメカニズムを解明する．さらに噴出したファイバの形状の制御や，様々な形状の穴の形成などを行った．