Details
| Original language | English |
|---|---|
| Pages (from-to) | 247-253 |
| Number of pages | 7 |
| Journal | Applied Physics B: Lasers and Optics |
| Volume | 80 |
| Issue number | 2 |
| Publication status | Published - 1 Feb 2005 |
Abstract
Femtosecond lasers have been successfully used to perform refractive surgery, by cutting within the bulk of the corneal tissue. As a side effect to the laser cutting there, a streak-like discoloration is observed in histological sections above and below the cutting plane, incident with the direction of laser propagation. These streak-shaped alterations of tissue are believed to originate from low free-electron densities not sufficient to cause optical breakdown. To understand the generation of the streaks, the nonlinear interaction of ultra-short laser pulses with water, as an approximation to corneal tissue, is simulated numerically using a model that simultaneously describes both the nonlinear pulse propagation and the generation of free electrons. The model is used to calculate spatial free electron density distributions generated by ultra-short pulses. Areas of high free-electron density correspond to optical breakdown, whereas areas of low density can be related to streaks. The numerical code can be adapted to practically any transparent dielectric Kerr medium, whose nonlinear optical parameters are known.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Applied Physics B: Lasers and Optics, Vol. 80, No. 2, 01.02.2005, p. 247-253.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Streak formation as side effect of optical breakdown during processing the bulk of transparent Kerr media with ultra-short laser pulses
AU - Arnold, C. L.
AU - Heisterkamp, A.
AU - Ertmer, W.
AU - Lubatschowski, H.
PY - 2005/2/1
Y1 - 2005/2/1
N2 - Femtosecond lasers have been successfully used to perform refractive surgery, by cutting within the bulk of the corneal tissue. As a side effect to the laser cutting there, a streak-like discoloration is observed in histological sections above and below the cutting plane, incident with the direction of laser propagation. These streak-shaped alterations of tissue are believed to originate from low free-electron densities not sufficient to cause optical breakdown. To understand the generation of the streaks, the nonlinear interaction of ultra-short laser pulses with water, as an approximation to corneal tissue, is simulated numerically using a model that simultaneously describes both the nonlinear pulse propagation and the generation of free electrons. The model is used to calculate spatial free electron density distributions generated by ultra-short pulses. Areas of high free-electron density correspond to optical breakdown, whereas areas of low density can be related to streaks. The numerical code can be adapted to practically any transparent dielectric Kerr medium, whose nonlinear optical parameters are known.
AB - Femtosecond lasers have been successfully used to perform refractive surgery, by cutting within the bulk of the corneal tissue. As a side effect to the laser cutting there, a streak-like discoloration is observed in histological sections above and below the cutting plane, incident with the direction of laser propagation. These streak-shaped alterations of tissue are believed to originate from low free-electron densities not sufficient to cause optical breakdown. To understand the generation of the streaks, the nonlinear interaction of ultra-short laser pulses with water, as an approximation to corneal tissue, is simulated numerically using a model that simultaneously describes both the nonlinear pulse propagation and the generation of free electrons. The model is used to calculate spatial free electron density distributions generated by ultra-short pulses. Areas of high free-electron density correspond to optical breakdown, whereas areas of low density can be related to streaks. The numerical code can be adapted to practically any transparent dielectric Kerr medium, whose nonlinear optical parameters are known.
UR - http://www.scopus.com/inward/record.url?scp=12344256598&partnerID=8YFLogxK
U2 - 10.1007/s00340-004-1701-5
DO - 10.1007/s00340-004-1701-5
M3 - Article
AN - SCOPUS:12344256598
VL - 80
SP - 247
EP - 253
JO - Applied Physics B: Lasers and Optics
JF - Applied Physics B: Lasers and Optics
SN - 0946-2171
IS - 2
ER -