Laser Solutions (한국레이저가공학회지)

Korean Society of Laser Processing (한국레이저가공학회)
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Color modification inside a transparent glass(BK7) using a femtosecond laser

펨토초 레이저 기반 투명유리(BK7) 내부의 컬러 미세형상 가공

  • Kim, Hoon-Young (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Yoon, Ji-Wook (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Choi, Won-Seok (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Park, Jung-Kyu (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Choi, Ji-Yeon (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Kim, Jae-Goo (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Whang, Kyoung-Hyun (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials)) ;
  • Cho, Sung-Hak (Nano Machining Laboratory, KIMM(Korea Institute of Machinery and Materials))
  • 김훈영 (한국기계연구원 나노공정연구실) ;
  • 윤지욱 (한국기계연구원 나노공정연구실) ;
  • 최원석 (한국기계연구원 나노공정연구실) ;
  • 박정규 (한국기계연구원 나노공정연구실) ;
  • 최지연 (한국기계연구원 나노공정연구실) ;
  • 김재구 (한국기계연구원 나노공정연구실) ;
  • 황경현 (한국기계연구원 나노공정연구실) ;
  • 조성학 (한국기계연구원 나노공정연구실)
  • Received : 2012.09.23
  • Accepted : 2012.09.26
  • Published : 2012.09.30
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Abstract

We have successfully formed brown colored patterns inside of a transparent borosilicate glass generally known as BK7, laying the focus of near infrared Ti: sapphire femtosecond laser beam in the bulk BK7 glass. It is important to keep the laser power well below the damage threshold of BK7 in forming the color center. According to the low laser power, there was no laser induced mechanical damage such as cracks or threads in the color formed area. From the absorbance spectrum and its gaussian fitting, we found the band gap of BK7, 4.21eV, and three absorption edges.

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