Corneal damage thresholds for multiple-pulse exposures to 2.02-um radiation from a Tm:YAG laser

Russell L. McCally; C. Brent Bargeron

doi:10.1117/12.426708

17 May 2001 Corneal damage thresholds for multiple-pulse exposures to 2.02-μm radiation from a Tm:YAG laser

Russell L. McCally, C. Brent Bargeron

Proceedings Volume 4246, Laser and Noncoherent Light Ocular Effects: Epidemiology, Prevention, and Treatment; (2001) https://doi.org/10.1117/12.426708
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

Corneal epithelial damage thresholds were determined for exposures to sequences of pulses from a Tm:YAG laser (wavelength 2.02 ?m). Pulse repetition frequencies were 1, 10, 20, and 100 Hz and individual pulse durations were 0.300 sec at 1 Hz, 0.025 sec at 10 and 20 Hz, and 0.005 sec at 100 Hz. Threshold damage is correlated by an empirical power lawof the form '1th= CN?, in which '1th is the threshold irradiance and N is the number of pulses. The constant C differs depending on the pulse repetition frequency and individual pulse duration. The exponent a varies between 0.22 and 0.29. For some exposure conditions the empirical power law underestimates the damage threshold for small numbers of pulses.

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Russell L. McCally and C. Brent Bargeron "Corneal damage thresholds for multiple-pulse exposures to 2.02-μm radiation from a Tm:YAG laser", Proc. SPIE 4246, Laser and Noncoherent Light Ocular Effects: Epidemiology, Prevention, and Treatment, (17 May 2001); https://doi.org/10.1117/12.426708

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KEYWORDS

Laser damage threshold

Cornea

Absorption

Eye

Medical research

Safety

Applied physics

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