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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 12 — Jun. 8, 2009
  • pp: 9840–9850

Interplay of wavelength, fluence and spot-size in free-electron laser ablation of cornea

M. Shane Hutson, Borislav Ivanov, Aroshan Jayasinghe, Gilma Adunas, Yaowu Xiao, Mingsheng Guo, and John Kozub  »View Author Affiliations

Optics Express, Vol. 17, Issue 12, pp. 9840-9850 (2009)

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Infrared free-electron lasers ablate tissue with high efficiency and low collateral damage when tuned to the 6-µm range. This wavelength-dependence has been hypothesized to arise from a multi-step process following differential absorption by tissue water and proteins. Here, we test this hypothesis at wavelengths for which cornea has matching overall absorption, but drastically different differential absorption. We measure etch depth, collateral damage and plume images and find that the hypothesis is not confirmed. We do find larger etch depths for larger spot sizes – an effect that can lead to an apparent wavelength dependence. Plume imaging at several wavelengths and spot sizes suggests that this effect is due to increased post-pulse ablation at larger spots.

© 2009 OSA

OCIS Codes
(140.2600) Lasers and laser optics : Free-electron lasers (FELs)
(170.1020) Medical optics and biotechnology : Ablation of tissue

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: April 1, 2009
Revised Manuscript: May 18, 2009
Manuscript Accepted: May 20, 2009
Published: May 27, 2009

Virtual Issues
Vol. 4, Iss. 8 Virtual Journal for Biomedical Optics

M. Shane Hutson, Borislav Ivanov, Aroshan Jayasinghe, Gilma Adunas, Yaowu Xiao, Mingsheng Guo, and John Kozub, "Interplay of wavelength, fluence and spot-size in free-electron laser ablation of cornea," Opt. Express 17, 9840-9850 (2009)

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