Excimer laser absorption on PMMA plate and on cornea: a practical approach using volume luminance

Petre P. Digulescu; Benone D. Carstocea; Livia Sterian

doi:10.1117/12.425168

9 April 2001 Excimer laser absorption on PMMA plate and on cornea: a practical approach using volume luminance

Petre P. Digulescu, Benone D. Carstocea, Livia Sterian

Proceedings Volume 4397, 11th International School on Quantum Electronics: Laser Physics and Applications; (2001) https://doi.org/10.1117/12.425168
Event: 11th International School on Quantum Electronics: Laser Physics and Applications, 2000, Varna, Bulgaria

Abstract

Excimer laser refractive surgery used in Ophthalmology in order to treat the human eye refraction problems has been performed over 10 years around the world. However a systematic approach of the physical phenomena and especially of the absorption on the cornea during the laser treatment is missing in the literature and the doctors are usually using empiric nomograms in order to achieve good results. The theoretical approach is difficult because of the complexity of the phenomena interconnected each to the others. The UV excimer laser beam used to controllably ablate the cornea is highly absorbed in the air and also is supplementary absorbed in the plume generated almost instantaneous as consequence of the ablation on the cornea. Because of this non-linear proces the energy of the laser beam delivered to the eye must be calibrated before each intervention on a patient. The purpose of the present work is to develop a mathematical model of the excimer laser absorption on PMMA and on human cornea based on a new physical notion, the Volume Luminance. The Volume Luminance is defined as volume density of the intensity of laser radiation. A brief theory of the Volume Luminance is also presented.

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Petre P. Digulescu, Benone D. Carstocea, and Livia Sterian "Excimer laser absorption on PMMA plate and on cornea: a practical approach using volume luminance", Proc. SPIE 4397, 11th International School on Quantum Electronics: Laser Physics and Applications, (9 April 2001); https://doi.org/10.1117/12.425168

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KEYWORDS

Cornea

Excimer lasers

Absorption

Laser ablation

Polymethylmethacrylate

Laser therapeutics

Calibration

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