27 May 1996 Laser damage threshold of gelatin and copper phthalocyanine-doped gelatin optical limiter
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We demonstrate optical limiting in a unique guest-host system which uses neither the typical liquid or solid host. Instead, we dope a gelatin gel host with a water soluble Copper (II) phthalocyaninetetrasulfonic acid, tetrasodium salt (CuPcTs). We report on the gelatin's viscoelasticity, laser damage threshold, and self healing of this damage. The viscoelastic gelatin has mechanical properties quite different than a liquid or solid. Our laser measurements demonstrate that the single shot damage threshold of the undoped gelatin host increases with decreasing gelatin concentration. The gelatin also has a much higher laser damage threshold than a stiff acrylic. Unlike brittle solids, the soft gelatin self heals from laser induced damage. Optical limiting test also show the utility of a gelatin host doped with CuPcTs. The CuPcTs/gelatin matrix is not damaged at incident laser energies 5 times the single shot damage threshold of the gelatin host. However, at this high laser energy the CuPcTs is photo bleached at the beam waist. We report photo bleached sites by annealing the CuPcTs/gelatin matrix.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark C. Brant, Mark C. Brant, Daniel G. McLean, Daniel G. McLean, Richard L. Sutherland, Richard L. Sutherland, Michael E. De Rosa, Michael E. De Rosa, Angela L. Campbell, Angela L. Campbell, Silvia Martinez, Silvia Martinez, } "Laser damage threshold of gelatin and copper phthalocyanine-doped gelatin optical limiter", Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); doi: 10.1117/12.240383; https://doi.org/10.1117/12.240383

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