KEYWORDS: Absorption, Telecommunications, Optical limiting, Chromophores, Nonlinear optics, Near infrared, Molecules, Americium, System on a chip, Pulsed laser operation
The rapid development of frequency-tunable pulsed lasers up to telecommunication wavelengths (1400-1600
nm) led to the design of new materials for nonlinear absorption in this spectral range. In this context, two
families of near infra-red (NIR) chromophores, namely heptamethine cyanine and aza-borondipyrromethene
(aza-bodipy) dyes were studied. In both cases, they show significant two-photon absorption (TPA) cross-sections
in the 1400-1600 nm spectral range and display good optical power limiting (OPL) properties. OPL curves were
interpreted on the basis of TPA followed by excited state absorption (ESA) phenomena. Finally these systems
have several relevant properties like nonlinear absorption properties, gram scale synthesis and high solubility. In
addition, they could be functionalized on several sites which open the way to numerous practical applications in
biology, solid-state optical limiting and signal processing.
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