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Proceedings Paper

Optimization of the parameters for intrastromal refractive surgery with ultrashort laser pulses
Author(s): Alexander Heisterkamp; Tammo Ripken; Holger Lubatschowski; Herbert Welling; Wolfgang Dommer; Elke Luetkefels; Thanongsak Mamom; Wolfgang Ertmer
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Paper Abstract

Focussing femtosecond laser pulses into a transparent media, such as corneal tissue, leads to optical breakdown, generation of a micro-plasma and, thus, a cutting effect inside the tissue. To proof the potential of fs-lasers in refractive surgery, three-dimensional cutting within the corneal stroma was evaluated. With the use of ultrashort laser pulses within the LASIK procedure (laser in situ keratomileusis) possible complications in handling of a mechanical knife, the microkeratome, can be reduced by using the treatment laser as the keratome itself. To study woundhealing effects, animal studies were carried out in rabbit specimen. The surgical outcome was analyzed by means of histological sections, as well as light and scanning electron microscopy. Dependencies on the dispersion caused by focussing optics were evaluated and optimized. Thus, pulse energies well below 1 (mu) J were sufficient to perform the intrastromal cuts. The laser pulses with a duration of 180 fs and energies of 0.5-100 (mu) J were provided by a modelocked frequency doubled erbium fiber-laser with subsequent chirped pulse amplification in a titanium sapphire amplifier at up to 3 kHz.

Paper Details

Date Published: 7 June 2001
PDF: 9 pages
Proc. SPIE 4245, Ophthalmic Technologies XI, (7 June 2001); doi: 10.1117/12.429279
Show Author Affiliations
Alexander Heisterkamp, Laser Zentrum Hannover e.V. (Germany)
Tammo Ripken, Laser Zentrum Hannover e.V. (Germany)
Holger Lubatschowski, Laser Zentrum Hannover e.V. (Germany)
Herbert Welling, Laser Zentrum Hannover e.V. (Germany)
Wolfgang Dommer, Univ. of Hannover School of Veterinary Medicine (Germany)
Elke Luetkefels, Univ. of Hannover School of Veterinary Medicine (Germany)
Thanongsak Mamom, Univ. of Hannover School of Veterinary Medicine (Germany)
Wolfgang Ertmer, Univ. of Hannover (Germany)


Published in SPIE Proceedings Vol. 4245:
Ophthalmic Technologies XI
Fabrice Manns; Per G. Soederberg; Arthur Ho, Editor(s)

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