Optical Limiting by Index-Matched Phase-Segregated Mixtures
The nonlinear optical response for index-matched, non-absorbing immiscible phases (liquid-solid, liquid-liquid, solid-solid) has been determined by means of open aperture z-scan measurements. In mixtures where one constituent shows a relatively high optical nonlinearity, rapid and reversible transformation to a light-scattering state is observed under conditions where a critical incident light fluence is exceeded. This passive broadband response is induced by a transient change in the dispersive part of the refractive index, and is based upon the Christiansen-Shelyubskii filter that at one time was used as a means to monitor the temperature of glass melts. Modeling studies are used to simulate scattering intensities in such textured composites as a function of composition, microstructure, and constituent optical properties. Results provide a rational approach to the selection of materials for use in these limiters. Challenges to preparing dispersed phase mixtures and their response to 532 nm nanosecond pulsed laser irradiation are described.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15009995
- Report Number(s):
- PNNL-SA-40502; KC0202020; TRN: US200433%%413
- Resource Relation:
- Conference: Quantum sensing and nanophotonic devices : Proceedings of SPIE--the International Society for Optical Engineering, San Jose, CA (US), 01/25/2004--01/29/2004; Other Information: PBD: 1 Jun 2004
- Country of Publication:
- United States
- Language:
- English
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