Characteristics of a surface plasma created during excimer laser photoablation

Jerzy S. Krasinski, Ronald R. Krueger, Czeslaw Radzewicz

Research output: Contribution to journalConference article

Abstract

Although photoablation is considered to be a nonthermal mechanism of tissue removal, previous investigators have shown local temperature rises along the surface of corneal tissue following excimer laser photoablation. These temperature increases can be explained by a hot cloud of ionized gas (plasma) created by the products of ablation. Our study demonstrates that the plasma absorbs incident laser light energy and reduces the transmission and scatter of light at the ablated surface. The spectrum of light generated on the surface consists of a number of atomic lines and molecular bands, thereby verifying the presence of excited and ionized atoms and molecules. The magnitude of light scattering and absorption by the plasma increases with both energy density and the length of the incident pulse. Plasma shielding and absorption of incident light occurs for laser pulsewidths greater than several nanoseconds. The plasma emission spectrum is fairly independent of the atmospheric environment and of the type of material ablated, as long as the material is organic. This suggests that the plasma is created from the ablated material. The temporal decay function is multiexponential and dissipates within a fraction of a microsecond, precluding interaction of the plasma with subsequent pulses during excimer laser photoablation.

Original languageEnglish (US)
Pages (from-to)306-311
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume1877
DOIs
StatePublished - Jun 24 1993
EventOphthalmic Technologies III 1993 - Los Angeles, United States
Duration: Jan 17 1993Jan 22 1993

Fingerprint

Excimer Laser
Excimer lasers
excimer lasers
Plasma
Plasmas
plasma spectra
Plasma Gases
Tissue
Absorption
Laser
Lasers
Wave transmission
Beam plasma interactions
Dissipate
ionized gases
organic materials
electromagnetic absorption
Ablation
pulses
Light scattering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Characteristics of a surface plasma created during excimer laser photoablation. / Krasinski, Jerzy S.; Krueger, Ronald R.; Radzewicz, Czeslaw.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 1877, 24.06.1993, p. 306-311.

Research output: Contribution to journalConference article

@article{1fc73ec400df48c2800e89145b0bce79,
title = "Characteristics of a surface plasma created during excimer laser photoablation",
abstract = "Although photoablation is considered to be a nonthermal mechanism of tissue removal, previous investigators have shown local temperature rises along the surface of corneal tissue following excimer laser photoablation. These temperature increases can be explained by a hot cloud of ionized gas (plasma) created by the products of ablation. Our study demonstrates that the plasma absorbs incident laser light energy and reduces the transmission and scatter of light at the ablated surface. The spectrum of light generated on the surface consists of a number of atomic lines and molecular bands, thereby verifying the presence of excited and ionized atoms and molecules. The magnitude of light scattering and absorption by the plasma increases with both energy density and the length of the incident pulse. Plasma shielding and absorption of incident light occurs for laser pulsewidths greater than several nanoseconds. The plasma emission spectrum is fairly independent of the atmospheric environment and of the type of material ablated, as long as the material is organic. This suggests that the plasma is created from the ablated material. The temporal decay function is multiexponential and dissipates within a fraction of a microsecond, precluding interaction of the plasma with subsequent pulses during excimer laser photoablation.",
author = "Krasinski, {Jerzy S.} and Krueger, {Ronald R.} and Czeslaw Radzewicz",
year = "1993",
month = "6",
day = "24",
doi = "10.1117/12.147543",
language = "English (US)",
volume = "1877",
pages = "306--311",
journal = "Proceedings of SPIE - The International Society for Optical Engineering",
issn = "0277-786X",
publisher = "SPIE",

}

TY - JOUR

T1 - Characteristics of a surface plasma created during excimer laser photoablation

AU - Krasinski, Jerzy S.

AU - Krueger, Ronald R.

AU - Radzewicz, Czeslaw

PY - 1993/6/24

Y1 - 1993/6/24

N2 - Although photoablation is considered to be a nonthermal mechanism of tissue removal, previous investigators have shown local temperature rises along the surface of corneal tissue following excimer laser photoablation. These temperature increases can be explained by a hot cloud of ionized gas (plasma) created by the products of ablation. Our study demonstrates that the plasma absorbs incident laser light energy and reduces the transmission and scatter of light at the ablated surface. The spectrum of light generated on the surface consists of a number of atomic lines and molecular bands, thereby verifying the presence of excited and ionized atoms and molecules. The magnitude of light scattering and absorption by the plasma increases with both energy density and the length of the incident pulse. Plasma shielding and absorption of incident light occurs for laser pulsewidths greater than several nanoseconds. The plasma emission spectrum is fairly independent of the atmospheric environment and of the type of material ablated, as long as the material is organic. This suggests that the plasma is created from the ablated material. The temporal decay function is multiexponential and dissipates within a fraction of a microsecond, precluding interaction of the plasma with subsequent pulses during excimer laser photoablation.

AB - Although photoablation is considered to be a nonthermal mechanism of tissue removal, previous investigators have shown local temperature rises along the surface of corneal tissue following excimer laser photoablation. These temperature increases can be explained by a hot cloud of ionized gas (plasma) created by the products of ablation. Our study demonstrates that the plasma absorbs incident laser light energy and reduces the transmission and scatter of light at the ablated surface. The spectrum of light generated on the surface consists of a number of atomic lines and molecular bands, thereby verifying the presence of excited and ionized atoms and molecules. The magnitude of light scattering and absorption by the plasma increases with both energy density and the length of the incident pulse. Plasma shielding and absorption of incident light occurs for laser pulsewidths greater than several nanoseconds. The plasma emission spectrum is fairly independent of the atmospheric environment and of the type of material ablated, as long as the material is organic. This suggests that the plasma is created from the ablated material. The temporal decay function is multiexponential and dissipates within a fraction of a microsecond, precluding interaction of the plasma with subsequent pulses during excimer laser photoablation.

UR - http://www.scopus.com/inward/record.url?scp=85076233273&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85076233273&partnerID=8YFLogxK

U2 - 10.1117/12.147543

DO - 10.1117/12.147543

M3 - Conference article

AN - SCOPUS:85076233273

VL - 1877

SP - 306

EP - 311

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

ER -