Excimer-laser-induced shock wave and its dependence on atmospheric environment

Ronald R. Krueger M.D.; Jerzy S. Krasinski; Czeslaw Radzewicz

doi:10.1117/12.147524

24 June 1993 Excimer-laser-induced shock wave and its dependence on atmospheric environment

Ronald R. Krueger M.D., Jerzy S. Krasinski, Czeslaw Radzewicz

Proceedings Volume 1877, Ophthalmic Technologies III; (1993) https://doi.org/10.1117/12.147524
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

High speed shadow photography is performed on excimer laser ablated porcine corneas and rubber stoppers to capture the excimer laser induced shock waves at various time delays between 40 and 320 nanoseconds. The shock waves in air, nitrogen, and helium are recorded by tangentially illuminating the ablated surface with a tunable dye laser, the XeCl excimer laser pulse. The excimer laser ablates the specimen and excites the dye laser, which is then passed through an optical delay line before illuminating the specimen. The shadow of the shock wave produced during ablation is then cast on a screen and photographed with a CCD video camera. The system is pulsed at 30 times per second to allow a video recording of the shock wave at a fixed time delay. We conclude that high energy acoustic waves and gaseous particles are liberated during excimer laser corneal ablation, and dissipate on a submicrosecond time scale. The velocity of their dissipation is dependent on the atmospheric environment and can be increased two-fold when the ablation is performed in a helium atmosphere. Therefore, local temperature increases due to the liberation of high energy gases may be reduced by using helium during corneal photoablation.

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Ronald R. Krueger M.D., Jerzy S. Krasinski, and Czeslaw Radzewicz "Excimer-laser-induced shock wave and its dependence on atmospheric environment", Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); https://doi.org/10.1117/12.147524

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KEYWORDS

Excimer lasers

Helium

Laser ablation

Cornea

Photography

Dye lasers

Nitrogen

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