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Proceedings Paper

Optical Limiting In Media With Absorbing Microparticles
Author(s): Kamjou Mansour; E. W. Van Stryland; M. J. Soileau
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Paper Abstract

We have characterized the nonlinearities observed in suspensions of carbon black particles in liquids (CBS). We have developed a preliminary explanation of the optical limiting characteristic of the CBS that qualitatively explains the low thresholds, broad-band response and other limiting characteristics. In this model, the microscopic carbon particles are heated by linear absorption to a temperature at which a plasma can be created by the optical field. These microplasmas rapidly expand, thus scattering the incident light and limiting the transmittance. This model is consistent with our observations that nonlinear scattering dominates transmission losses. We find that limiting depends on the input fluence (J/cm2) rather than irradiance (W/cm2). Therefore, limiting works well (i.e., low limiting energy) for long pulses (≥ 10 nsec) but is less effective for short pulses (≈ psec). In addition, the CBS rapidly degrades with repetitive laser firings, thus, flowing or moving the liquid between firings is necessary.

Paper Details

Date Published: 30 August 1989
PDF: 12 pages
Proc. SPIE 1105, Materials for Optical Switches, Isolators, and Limiters, (30 August 1989);
Show Author Affiliations
Kamjou Mansour, University of Central Florida (United States)
E. W. Van Stryland, University of Central Florida (United States)
M. J. Soileau, University of Central Florida (United States)

Published in SPIE Proceedings Vol. 1105:
Materials for Optical Switches, Isolators, and Limiters
M. J. Soileau, Editor(s)

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