Adaptive optics for reduced threshold energy in femtosecond laser induced optical breakdown in water based eye model

Anja Hansen; Alexander Krueger; Tammo Ripken

doi:10.1117/12.2015298

26 March 2013 Adaptive optics for reduced threshold energy in femtosecond laser induced optical breakdown in water based eye model

Anja Hansen, Alexander Krueger, Tammo Ripken

Author Affiliations +

Proceedings Volume 8567, Ophthalmic Technologies XXIII; 85672F (2013) https://doi.org/10.1117/12.2015298
Event: SPIE BiOS, 2013, San Francisco, California, United States

Abstract

In ophthalmic microsurgery tissue dissection is achieved using femtosecond laser pulses to create an optical breakdown. For vitreo-retinal applications the irradiance distribution in the focal volume is distorted by the anterior components of the eye causing a raised threshold energy for breakdown. In this work, an adaptive optics system enables spatial beam shaping for compensation of aberrations and investigation of wave front influence on optical breakdown. An eye model was designed to allow for aberration correction as well as detection of optical breakdown. The eye model consists of an achromatic lens for modeling the eye’s refractive power, a water chamber for modeling the tissue properties, and a PTFE sample for modeling the retina’s scattering properties. Aberration correction was performed using a deformable mirror in combination with a Hartmann-Shack-sensor. The influence of an adaptive optics aberration correction on the pulse energy required for photodisruption was investigated using transmission measurements for determination of the breakdown threshold and video imaging of the focal region for study of the gas bubble dynamics. The threshold energy is considerably reduced when correcting for the aberrations of the system and the model eye. Also, a raise in irradiance at constant pulse energy was shown for the aberration corrected case. The reduced pulse energy lowers the potential risk of collateral damage which is especially important for retinal safety. This offers new possibilities for vitreo-retinal surgery using femtosecond laser pulses.

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Anja Hansen, Alexander Krueger, and Tammo Ripken "Adaptive optics for reduced threshold energy in femtosecond laser induced optical breakdown in water based eye model", Proc. SPIE 8567, Ophthalmic Technologies XXIII, 85672F (26 March 2013); https://doi.org/10.1117/12.2015298

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KEYWORDS

Adaptive optics

Eye models

Femtosecond phenomena

Wavefronts

Aberration correction

Eye

Scattering

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