Nonlinear transmittance through laser protection barrier: reverse photosaturation of 1-phenylazo 2-napthalenol in polymer host

Michael W. Mayo; William P. Roach; Craig M. Bramlette; M. D. Gavornik

doi:10.1117/12.146892

17 June 1993 Nonlinear transmittance through laser protection barrier: reverse photosaturation of 1-phenylazo 2-napthalenol in polymer host

Michael W. Mayo, William P. Roach, Craig M. Bramlette, M. D. Gavornik

Author Affiliations +

Proceedings Volume 1864, Solid State Lasers IV; (1993) https://doi.org/10.1117/12.146892
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

We have measured the time-dependent transmittance of 'orange plastic' samples composed of the dye 1-Phenylazo 2-Napthalenol embedded in both polymethyl methacrylate (PMMA) and polycarbonate at various dye concentrations. The spectrophotometric transmittance below 520 nm is measured to be less than 0.01% for the PMMA samples. However, a 6.4 mm thick PMMA sample containing 0.008% dye concentration reached a steady-state transmittance of 0.5% in 15 seconds for samples irradiated with continuous wave 514.5 nm light at 12 mW/cm². The transmittance reached a steady-state of 11% in 2.5 seconds when irradiated with 514.5 nm at greater than 600 W/cm² incident. This represents a three order of magnitude increase in the transmittance at relatively low irradiance levels. In contrast, a 6.4 nm thick PMMA sample containing a dye concentration of 0.03% continued to transmit less than 0.01% with increased irradiance until the material reached damage threshold. We report ground-state absorption curves and transmittance versus time measurements for dye concentrations ranging from 0.008% to 0.15% in PMMA and polycarbonate. We compared the steady-state transmittance at 514.5 nm to the incident irradiance. We propose possible mechanisms associated with the nonlinear transmittance characteristics of 1-Phenylazo 2-Napthalenol.

Citation Download Citation

Michael W. Mayo, William P. Roach, Craig M. Bramlette, and M. D. Gavornik "Nonlinear transmittance through laser protection barrier: reverse photosaturation of 1-phenylazo 2-napthalenol in polymer host", Proc. SPIE 1864, Solid State Lasers IV, (17 June 1993); https://doi.org/10.1117/12.146892

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