Title

Optical Breakdown In Particle Suspension

Keywords

.53; 1.06; Carbon Black Suspension; M; Nonlinear Absorption; Nonlinear Scattering; Nonlinear Transmission; Nsec Pulses; Optical Limiting; Psec Pulses

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 limiting thresholds. We have found that the limiting depends primarily on the input optical fluence (J/cm2) rather irradiance (W/cm2). We have monitored transmission, side scattered light, and the photoacoustic response of the CBS simultaneously. The nonlinear scattered light appears to be the dominant nonlinearity. Additionally, we have observed that the nonlinearities disappear after repeated laser firings. essense, we are performing a laser induced damage experiment, and we have prepared a material with a low damage threshold. These data have led us to the following model. The carbon first linearly absorbs the input light efficiently. carbon is rapidly heated, vaporizes and ionizes to form a rapidly expanding microplasma. This plasma absorbs and scatters subsequent light, thus limiting the transmittance.

Publication Date

11-1-1990

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

1438

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.2294423

Socpus ID

85075514263 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85075514263

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