Laser Solutions (한국레이저가공학회지)

Korean Society of Laser Processing (한국레이저가공학회)
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Fabrication of Internal Gratings in PDMS Using a Femtosecond Laser

  • Park, Jung-Kyu (Nano-machining Lab., KIMM(Korea Institute of Machinery and Materials)) ;
  • Cho, Sung-Hak (Nano-machining Lab., KIMM(Korea Institute of Machinery and Materials)) ;
  • Yu, Jae-Yong (Nano-machining Lab., KIMM(Korea Institute of Machinery and Materials)) ;
  • Kim, Jae-Gu (Nano-machining Lab., KIMM(Korea Institute of Machinery and Materials)) ;
  • Sugioka, Koji (Laser Technology Laboratory, RIKEN-Advance Science Institute) ;
  • Hong, Jong-Wook (Department of Mechanical Engineering, Auburn University) ;
  • Heo, Won-Ha (Duckyu Co. Ltd.) ;
  • Hwang, Kyung-Hyun (Nano-machining Lab., KIMM(Korea Institute of Machinery and Materials))
  • Received : 2011.02.23
  • Accepted : 2011.03.07
  • Published : 2011.03.31
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Abstract

Photo-induced gratings m flexible PDMS (polydimethly siloxane) film are directly written by a high-intensity femtosecond (130fs) Ti: Sapphire laser (${\lambda}_p$ = 800nm). The refractive index modifications with $4\;{\mu}m$ diameters were photo-induced after the femtosecond irradiation with peak intensities of more than $1{\times}10^{11}W/cm^2$. The graded refractive index profile was fabricated to be a symmetric around the center of the point at which femtosecond laser by controlling both laser power and focused depth. The change on refractive index in the laser-modified regions was estimated to be approximately $10^{-3}$. The internal flexible symmetric diffraction gratings in PDMS film was successfully fabricated using a femtosecond laser.

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