Nonlinear optical behaviour of C60 and MWCNT suspensions far beyond the nonlinear threshold

S. Dengler; B. Eberle

doi:10.1117/12.2325326

8 October 2018 Nonlinear optical behaviour of C₆₀ and MWCNT suspensions far beyond the nonlinear threshold

S. Dengler, B. Eberle

Proceedings Volume 10801, Optical Materials and Biomaterials in Security and Defence Systems Technology XV; 1080107 (2018) https://doi.org/10.1117/12.2325326
Event: SPIE Security + Defence, 2018, Berlin, Germany

Abstract

Many carbon-based nanomaterials exhibit nonlinear optical response under intense laser radiation what makes them promising candidates for laser protection devices. They strongly attenuate intense laser light, while exhibiting high transmittance at low irradiation levels. In literature this behavior is mainly related to nonlinear absorption and nonlinear scattering. C₆₀ and MWCNT are carbon-based materials with high optical limiting efficiency. It is generally believed that the main optical limiting mechanism of MWCNT suspensions is NL scattering whereas C₆₀ solutions show mainly nonlinear absorption. In the case of MWCNT we observed a strong scattering signal arising near the nonlinear threshold when tested with nanosecond laser pulses at 532 nm, which is in agreement with results in literature. C₆₀ exhibits only weak NL scattering and their OL behavior is due to NL absorption in the intermediate NL regime. In addition, we observed a diffraction pattern for high input energies, induced by local refractive index changes.

Citation Download Citation

S. Dengler and B. Eberle "Nonlinear optical behaviour of C₆₀ and MWCNT suspensions far beyond the nonlinear threshold", Proc. SPIE 10801, Optical Materials and Biomaterials in Security and Defence Systems Technology XV, 1080107 (8 October 2018); https://doi.org/10.1117/12.2325326

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KEYWORDS

Scattering

Laser scattering

Transmittance

Nonlinear optics

Light scattering

Absorption

Optical limiting

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