Optical Power Limiter
Abstract
We have performed a fundamental study of optical/materials interactions which can be used for a passive control of the spatial energy (or power) distribution of optical beams. The study included materials for use in various spectral bands within the spectral range of the UV to 11 microns and the temporal range from cw to picoseconds. We concentrated on materials and concepts with broadband response. Materials studied under DARPA/CNVEO program include aromatic liquids, liquid crystals, semiconductors, and liquid suspensions. We have demonstrated optical limiting using nonlinear absorption in liquid crystals, optical self-action (self-focusing) in liquids and solids, and multiphoton absorption plus sub-sequent self-defocusing in semiconductors. We have theoretically modeled the nonlinearities in these materials and understand the limiting mechanisms although in the organic materials the magnitudes of the nonlinearities are not well understood. In the semiconductors we have developed a predictive capability that allows us to calculate the nonlinearity knowing only a few fundamental material parameters. In addition, we have developed a preliminary model that explains the very low limiting thresholds observed in a liquid suspension of carbon particles as due to nonlinear scattering from rapidly expanding microplasmas initiated by thermionic emission.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 21, 1988
- Accession Number
- ADA203964
Entities
People
- Eric W. Van Stryland
- M. J. Soileau
Organizations
- University of Central Florida