A densely packed bed of alkaline earth fluoride particles percolated by a fluid medium has been investigated as a potential index-matched optical limiter in the spirit of a Christiansen-Shelyubskii filter. Marked optical limiting was observed through this transparent medium under conditions where the focused second-harmonic output of a Q-swtiched Nd: YAG laser was on the order of about 1 J/cm2. An open-aperture Z-scan technique was used to quantify the limiting behavior. In this case, the mechanism of optical limiting is thought to be a nonlinear shift in the fluid index of refraction, resulting in an index mismatch between the disparate phases at high laser fluence.
Revised: January 17, 2011 |
Published: August 1, 2001
Citation
Exarhos G.J., K.F. Ferris, C.F. Windisch, B.J. Bozlee, S.M. Risser, and S.L. Van Swam. 2001.An Index-Mismatch Scattering Approach to Optical Limiting. In Laser-Induced Damage in Optical Materials: 16-18 Oct. 2000, Boulder, CO. Proceedings of the SPIE - The International Society for Optical Engineering., 4347, 432-443. Bellingham, Washington:SPIE-Int. Society Optical Engineering.PNNL-SA-33851.