Plasma mediated ablation of biological tissues with ultrashort laser pulses

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Plasma mediated ablation of collagen gels and porcine cornea was studied at various laser pulse durations in the range from 350 fs to 1 ns at 1,053 nm wavelength. A time resolved stress detection technique was employed to measure transient stress profiles and amplitudes. Optical microscopy was used to characterize ablation craters qualitatively, while a wide band acoustic transducer helped to quantify tissue mechanical response and the ablation threshold. The ablation threshold was measured as a function of laser pulse duration and linear absorption coefficient. For nanosecond pulses the ablation threshold was found to have a strong dependence on the ... continued below

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10 p.

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Oraevsky, A.A.; DaSilva, L.B. & Feit, M.D. March 8, 1995.

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Description

Plasma mediated ablation of collagen gels and porcine cornea was studied at various laser pulse durations in the range from 350 fs to 1 ns at 1,053 nm wavelength. A time resolved stress detection technique was employed to measure transient stress profiles and amplitudes. Optical microscopy was used to characterize ablation craters qualitatively, while a wide band acoustic transducer helped to quantify tissue mechanical response and the ablation threshold. The ablation threshold was measured as a function of laser pulse duration and linear absorption coefficient. For nanosecond pulses the ablation threshold was found to have a strong dependence on the linear absorption coefficient of the material. As the pulse length decreased into the subpicosecond regime the ablation threshold became insensitive to the linear absorption coefficient. The ablation efficiency was found to be insensitive to both the laser pulse duration and the linear absorption coefficient. High quality ablation craters with no thermal or mechanical damage to surrounding material were obtained with 350 fs laser pulses. The mechanism of optical breakdown at the tissue surface was theoretically investigated. In the nanosecond regime, optical breakdown proceeds as an electron collisional avalanche ionization initiated by thermal seed electrons. These seed electrons are created by heating of the tissue by linear absorption. In the ultrashort pulse range, optical breakdown is initiated by the multiphoton ionization of the irradiated medium (6 photons in case of tissue irradiated at 1,053 nm wavelength), and becomes less sensitive to the linear absorption coefficient. The energy deposition profile is insensitive to both the laser pulse duration and the linear absorption coefficient.

Physical Description

10 p.

Notes

OSTI as DE95011748

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  • SPIE `95: SPIE conference on optics, electro-optics, and laser application in science, engineering and medicine, San Jose, CA (United States), 5-14 Feb 1995

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  • Other: DE95011748
  • Report No.: UCRL-JC--120215
  • Report No.: CONF-950226--39
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/71373 | External Link
  • Office of Scientific & Technical Information Report Number: 71373
  • Archival Resource Key: ark:/67531/metadc707739

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  • March 8, 1995

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • June 24, 2016, 1:27 p.m.

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Oraevsky, A.A.; DaSilva, L.B. & Feit, M.D. Plasma mediated ablation of biological tissues with ultrashort laser pulses, report, March 8, 1995; California. (digital.library.unt.edu/ark:/67531/metadc707739/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.