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1 July 1990 Study of saturation in commercial laser goggles
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Organic dyes often are dissolved in plastic materials to produce filters which serve as laser eye protection. In two recent studies performed on one such filter nonlinear changes in the absorbance of the filter were observed with changes in radiant exposure (J/cm ). The nonlinear changes were noted at a laser wavelength of 694 nm but not at 1064 nm. One proposed mechanism for the changes in absorbance involves " entrapment^" of the excited chromophores in a stable excited triplet state during . the descent to the ground state. This mechanism involves electronic transitions which photons with a wavelength of 694 nm would produce . However photons with a wavelength of 1 0 6 4 nm usually would not be expected to cause electronic transitions. The preseht study was performed to investigate the relationship of wavelength and nonlinear changes in absOrbances . At an intermediate near infrared wavelength the absorbances of three different commercially available plastic laser protective goggles were measured at various radiant exposure levels. A decrease in absorbance with increase in radiant exposure was observed in at least two of the samples. These results suggest that a triplet state may be involved in the region of approximately 750 nm but further investigation is required 2 . BACKGROUND In one frequently used laser eye protective filter designed to absorb at both 694. 3 and 1064 nra a decided drop in
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anita A. Robinson, Wesley J. Marshall, and Scott G. Dudevoir "Study of saturation in commercial laser goggles", Proc. SPIE 1207, Laser Safety, Eyesafe Laser Systems, and Laser Eye Protection, (1 July 1990);

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