Title

Optical Nonlinearitles In Carbon Black Particles

Abstract

We have characterized the nonlinear optical properties of carbon black particles in liquids and layers deposited on glass. We find that the limiting is dependent on the energy density (fluence) and that the material changes from a linear absorber to a nonlinear scatterer for fluence levels 0.2 J/cm2 and 0.38 J/cm2 for 0.532 jim, 14 ns and 1.064 pm, 20 ns laser pulses respectively. In this paper, we will discuss the possible mechanisms that have been proposed to explain the nonlinear scattering. These mechanisms are plasma formation, micro-bubble formation and change in index of refraction of the liquid surrounding the particles. We will show through a series of experiments that plasma formation is consistent with all of the experimental results while bubble formation may influence the limiting behavior at fluence levels substantially above the limiting threshold. 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.

Publication Date

10-1-1990

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

1307

Number of Pages

350-362

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.21684

Socpus ID

85075511968 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85075511968

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