Characterizing temperature-dependent photo-oxidation to explain the abrupt transition from thermal to non-thermal laser damage mechanisms at 413 nm

Michael L. Denton; C. D. Clark III; Gary D. Noojin; Larry E. Estlack; Adam C. Schenk; Curtis W. Burney; Benjamin A. Rockwell; Robert J. Thomas

doi:10.1117/12.873469

17 February 2011 Characterizing temperature-dependent photo-oxidation to explain the abrupt transition from thermal to non-thermal laser damage mechanisms at 413 nm

Michael L. Denton, C. D. Clark III, Gary D. Noojin, Larry E. Estlack, Adam C. Schenk, Curtis W. Burney, Benjamin A. Rockwell, Robert J. Thomas

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Proceedings Volume 7897, Optical Interactions with Tissue and Cells XXII; 78970K (2011) https://doi.org/10.1117/12.873469
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

Laser exposure duration dictates whether tissues subjected to short visible wavelengths ( ≤ 514 nm) are damaged by thermal (e.g. 0.1 s) or non-thermal ( ≥ 100 s) mechanisms. Somewhere between these extremes, an abrupt transition between the two damage mechanisms has been found for both in vitro and animal retinal models (J. Biomed. Opt. 15, 030512, 2010). Non-thermal (photochemical) damage is characterized by an inverse relationship between damage threshold irradiance and exposure duration (irradiance reciprocity). We have found that exposures of 40 - 60 s in an in vitro retinal model require radiant exposures well above the expected requirement for nonthermal damage, introducing the concept that damage was forced to be thermal in mechanism. Here we quantify and compare photo-oxidative processes at ambient temperatures between 35 - 50 °C.

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Michael L. Denton, C. D. Clark III, Gary D. Noojin, Larry E. Estlack, Adam C. Schenk, Curtis W. Burney, Benjamin A. Rockwell, and Robert J. Thomas "Characterizing temperature-dependent photo-oxidation to explain the abrupt transition from thermal to non-thermal laser damage mechanisms at 413 nm", Proc. SPIE 7897, Optical Interactions with Tissue and Cells XXII, 78970K (17 February 2011); https://doi.org/10.1117/12.873469

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KEYWORDS

In vitro testing

Luminescence

Laser damage threshold

Laser induced damage

Animal model studies

Temperature metrology

Data modeling

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