Laser Solutions (한국레이저가공학회지)

Korean Society of Laser Processing (한국레이저가공학회)
권호 표지

Optical diffraction gratings embedded in BK-7 glasses by tightly focused femtosecond laser

  • Yoon, Ji Wook (Department of Nano-Mechatronics, University of Science and Technology (UST) Nano Machining Laboratory, Korea Institute of Machinery and Materials (KIMM)) ;
  • Choi, Won Suk (Department of Nano-Mechatronics, University of Science and Technology (UST) Nano Machining Laboratory, Korea Institute of Machinery and Materials (KIMM)) ;
  • Kim, Hoon Young (Department of Nano-Mechatronics, University of Science and Technology (UST) Nano Machining Laboratory, Korea Institute of Machinery and Materials (KIMM)) ;
  • Cho, Sung-Hak (Department of Nano-Mechatronics, University of Science and Technology (UST) Nano Machining Laboratory, Korea Institute of Machinery and Materials (KIMM))
  • Received : 2014.06.24
  • Accepted : 2014.06.27
  • Published : 2014.06.30
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Abstract

Optical embedded diffraction gratings with the bulk modification in BK-7 glass plates excited by tightly focused high-intensity femtosecond (130fs) Ti: sapphire laser (peak wavelength = 790nm) were demonstrated. The structural modifications with diameters ranging from 400nm to $4{\mu}m$ were photo-induced after plasma formation occurred upon irradiation with peak intensities of more than $1{\times}1013W/cm^2$. The graded refractive index profile was fabricated to be a symmetric around from the center of the point at which low-density plasma occurred. The maximum refractive index change was estimated to be $1.5{\times}10^{-2}$. The two optical embedded gratings in BK-7 glass plate were demonstrated with refractive index modification induced by the scanning of low-density plasma formation.

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