Experimental and numerical investigation of highly absorbing nonlinear organic chromophores

E. Parilov; M. J. Potasek

doi:10.1117/12.909101

15 February 2012 Experimental and numerical investigation of highly absorbing nonlinear organic chromophores

E. Parilov, M. J. Potasek

Proceedings Volume 8240, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI; 82401N (2012) https://doi.org/10.1117/12.909101
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

We have developed a mathematical/numerical framework based on computational transition modules and measured ultrafast laser light propagating through nonlinear materials. The numerical framework can be applied to a broad set of photo-activated materials and lasers, and can optimize photo-physical parameters in multi-photon absorbers. Two photon (TPA) processes are particularly useful in many applications including fluorescence imaging, optical data storage, micro-fabrication, and nanostructured quantum dots for optical limiters. Laser transmission measurements of the organic molecular chromophore, AF455-known TPA material-were taken with a 175 fs, λ₀=780nm, plane-polarized light pulses from Ti:S regenerative amplifier into a 5.1mm thick PMMA slab doped with the chromophore. The range of input energies (intensities) in this experiment was 0.01μJ (0.97 GW/cm²) to 25 μJ (2.4 x10³ GW/cm²). Experiments showed that for intensities beyond several μJ, the material did not saturate as predicted by traditional theory. We included excited-state absorption (ESA), as demonstrated by the absorption spectrum, which still could not account for the deviation. To understand this result we used our framework to show that an unexpected/unknown higher energy level was being populated. We calculated the entire experimental curve from 0.01μJ (0.97 GW/cm²) to 25 μJ (2.4 x10³ GW/cm²) and found excellent agreement with the experimental data.

Citation Download Citation

E. Parilov and M. J. Potasek "Experimental and numerical investigation of highly absorbing nonlinear organic chromophores", Proc. SPIE 8240, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI, 82401N (15 February 2012); https://doi.org/10.1117/12.909101

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