Origin of high-speed modification of refractive index in fused quartz by vacuum ultraviolet laser irradiation

Jie Zhang*, Koji Sugioka, Satoshi Wada, Hideo Tashiro, Koichi Toyoda, Shlomo Ruschin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report on high-speed modification and a large change of the refractive index on the order of 10-2 of fused quartz upon vacuum ultraviolet (VUV) laser irradiation. The origin of the large refractive index change is discussed based on the laser-induced color center and surface morphology changes. The VUV-UV absorption spectrum 0f modified samples indicates the formation of a color center at around 163 nm (≡Si-Si≡ defect), which is attributed to bond scission of fused quartz by VUV laser-induced electron excitation. On the other hand, simultaneous UV laser irradiation in our present experimental scheme is responsible for the generation of a surface damage at the large number of pulses, which causes scattering and deterioration of the optical properties of the irradiated regions.

Original languageEnglish
Pages (from-to)789-795
Number of pages7
JournalIEEE Journal of Selected Topics in Quantum Electronics
Volume3
Issue number3
DOIs
StatePublished - Jun 1997

Keywords

  • Color center
  • Fused quartz
  • Refractive index
  • Surface morphology
  • VUV laser modification

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