Surface ablation of corneal stroma with few-cycle laser pulses at 800 nm
- 22 December 2010
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 19 (1), 230-240
- https://doi.org/10.1364/oe.19.000230
Abstract
We report measurements of crater diameter and surface ablation threshold as a function of laser fluence in porcine corneal stroma and fused silica with pulse durations of 7 fs (2.7 optical cycles), 30 fs and 100 fs at 800 nm. For laser pulses with Gaussian radial intensity profile, we show experimentally that the square of the crater diameter is a linear function of the logarithm of the fluence in fused silica, while it is closer to a linear function of the fluence in corneal stroma. Extrapolating these relations to zero diameter indicates that for both media the minimum fluence required for surface ablation is reduced with shorter pulse duration. A simple theoretical model suggests that this effect is due to a more significant contribution of photoionization as the laser pulse duration shortens.Keywords
This publication has 26 references indexed in Scilit:
- A Novel Technique: Eccentric Lamellar Keratolimbal Allografting Using a Femtosecond LaserCornea, 2010
- Femtosecond laser-assisted corneal surgeryCurrent Opinion in Opthalmology, 2010
- Therapeutischer Einsatz des Femtosekundenlasers in der HornhautchirurgieKlinische Monatsblätter für Augenheilkunde, 2010
- Single-Cycle Nonlinear OpticsScience, 2008
- Intracorneal rings for keratoconus and keratectasiaJournal of Cataract & Refractive Surgery, 2007
- Mini-invasive corneal surgery and imaging with femtosecond lasersOptics Express, 2004
- Corneal refractive surgery with femtosecond lasersIEEE Journal of Selected Topics in Quantum Electronics, 1999
- Dynamics of shock waves and cavitation bubbles generated by picosecond laser pulses in corneal tissue and waterLasers in Surgery and Medicine, 1994
- Compression of amplified chirped optical pulsesOptics Communications, 1985
- Simple technique for measurements of pulsed Gaussian-beam spot sizesOptics Letters, 1982