Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye

Paul K. Kennedy; Ewan M. Wright; Quanyuan Feng; Kirk Cook; Daniel X. Hammer; Charles R. Thompson; Jerome V. Moloney; Benjamin A. Rockwell; Jeffrey J. Druessel; Alan C. Newell

Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye

Paul K. Kennedy, Ewan M. Wright, Quanyuan Feng, Kirk Cook, Daniel X. Hammer, Charles R. Thompson, Jerome V. Moloney, Benjamin A. Rockwell, Jeffrey J. Druessel, Alan C. Newell

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

3 Scopus citations

Abstract

As part of a research program to understand and model eye damage produced by exposure to subnanosecond laser pulses, an effort is currently being made to model and analyze ultrashort pulse propagation from the cornea to the retina. Both analytical models and numerical simulations are being used to analyze the effects of self-focusing, laser-induced breakdown (LIB), and plasma-pulse interaction. The modeling effort is coupled with experimental measurements of LIB thresholds and plasma shielding for visible, picosecond (psec) and femtosecond (fsec) pulses in water, which serves as a reasonable simulant for the vitreous humor of the eye. Comparison of LIB thresholds to the critical power for self-focusing indicates that self-focusing has little effect on LIB thresholds for long psec pulses. For short psec and fsec pulses, however, numerical simulations show that self-focusing is critical to LIB in water. These results indicate that self-focusing may play a role in fsec pulse ocular damage, by influencing whether LIB and plasma-pulse interaction occur at the retina, in the vitreous, or both. Both the location of the LIB event and the amount of plasma shielding can significantly effect the degree of damage.

Original language	English (US)
Title of host publication	Proceedings of SPIE - The International Society for Optical Engineering
Editors	Steven L. Jacques
Pages	390-401
Number of pages	12
State	Published - Jan 1 1996
Externally published	Yes
Event	Laser-Tissue Interaction VII - San Jose, CA, USA Duration: Jan 29 1996 → Feb 1 1996

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	2681

Other

Other	Laser-Tissue Interaction VII
City	San Jose, CA, USA
Period	1/29/96 → 2/1/96

ASJC Scopus subject areas

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

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Cite this

Kennedy, P. K., Wright, E. M., Feng, Q., Cook, K., Hammer, D. X., Thompson, C. R., Moloney, J. V., Rockwell, B. A., Druessel, J. J., & Newell, A. C. (1996). Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye. In S. L. Jacques (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (pp. 390-401). (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2681).

Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye. / Kennedy, Paul K.; Wright, Ewan M.; Feng, Quanyuan; Cook, Kirk; Hammer, Daniel X.; Thompson, Charles R.; Moloney, Jerome V.; Rockwell, Benjamin A.; Druessel, Jeffrey J.; Newell, Alan C.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / Steven L. Jacques. 1996. p. 390-401 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 2681).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kennedy, PK, Wright, EM, Feng, Q, Cook, K, Hammer, DX, Thompson, CR, Moloney, JV, Rockwell, BA, Druessel, JJ & Newell, AC 1996, Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye. in SL Jacques (ed.), Proceedings of SPIE - The International Society for Optical Engineering. Proceedings of SPIE - The International Society for Optical Engineering, vol. 2681, pp. 390-401, Laser-Tissue Interaction VII, San Jose, CA, USA, 1/29/96.

Kennedy PK, Wright EM, Feng Q, Cook K, Hammer DX, Thompson CR et al. Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye. In Jacques SL, editor, Proceedings of SPIE - The International Society for Optical Engineering. 1996. p. 390-401. (Proceedings of SPIE - The International Society for Optical Engineering).

Kennedy, Paul K. ; Wright, Ewan M. ; Feng, Quanyuan ; Cook, Kirk ; Hammer, Daniel X. ; Thompson, Charles R. ; Moloney, Jerome V. ; Rockwell, Benjamin A. ; Druessel, Jeffrey J. ; Newell, Alan C. / Effects of laser-induced breakdown, self-focusing, and plasma shielding on ultrashort-pulse propagation in the eye. Proceedings of SPIE - The International Society for Optical Engineering. editor / Steven L. Jacques. 1996. pp. 390-401 (Proceedings of SPIE - The International Society for Optical Engineering).

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abstract = "As part of a research program to understand and model eye damage produced by exposure to subnanosecond laser pulses, an effort is currently being made to model and analyze ultrashort pulse propagation from the cornea to the retina. Both analytical models and numerical simulations are being used to analyze the effects of self-focusing, laser-induced breakdown (LIB), and plasma-pulse interaction. The modeling effort is coupled with experimental measurements of LIB thresholds and plasma shielding for visible, picosecond (psec) and femtosecond (fsec) pulses in water, which serves as a reasonable simulant for the vitreous humor of the eye. Comparison of LIB thresholds to the critical power for self-focusing indicates that self-focusing has little effect on LIB thresholds for long psec pulses. For short psec and fsec pulses, however, numerical simulations show that self-focusing is critical to LIB in water. These results indicate that self-focusing may play a role in fsec pulse ocular damage, by influencing whether LIB and plasma-pulse interaction occur at the retina, in the vitreous, or both. Both the location of the LIB event and the amount of plasma shielding can significantly effect the degree of damage.",

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