Advanced optical system for scanning-spot photorefractive keratectomy (PRK)

Michael Mrochen; Christian Wullner; Vladimir A. Semchishen; Theo Seiler

doi:10.1117/12.350609

18 June 1999 Advanced optical system for scanning-spot photorefractive keratectomy (PRK)

Michael Mrochen, Christian Wullner, Vladimir A. Semchishen, Theo Seiler

Proceedings Volume 3591, Ophthalmic Technologies IX; (1999) https://doi.org/10.1117/12.350609
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Purpose: The goal of this presentation is to discuss the use of the Light Shaping Beam Homogenizer in an optical system for scanning-spot PRK. Methods: The basic principle of the LSBH is the transformation of any incident intensity distribution by light scattering on an irregular microlens structure z = f(x,y). The relief of this microlens structure is determined by a defined statistical function, i.e. it is defined by the mean root-squared tilt σ of the surface relief. Therefore, the beam evolution after the LSBH and in the focal plane of an imaging lens was measured for various root-squared tilts. Beside this, an optical setup for scanning-spot PRK was assembled according to the theoretical and experimental results. Results: The divergence, homogeneity and the Gaussian radius of the intensity distribution in the treatment plane of the scanning-spot PRK laser system is mainly characterized by dependent on root-mean-square tilt σ of the LSBH, as it will be explained by the theoretical description of the LSBH. Conclusions: The LSBH represents a simple, low cost beam homogenizer with low energy losses, for scanning-spot excimer laser systems.

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Michael Mrochen, Christian Wullner, Vladimir A. Semchishen, and Theo Seiler "Advanced optical system for scanning-spot photorefractive keratectomy (PRK)", Proc. SPIE 3591, Ophthalmic Technologies IX, (18 June 1999); https://doi.org/10.1117/12.350609

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KEYWORDS

Homogenization

Laser systems engineering

Beam homogenizers

Microlens

Light scattering

Reflection

Profiling

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