Organic nanocrystals grown in gel glasses for optical-power- limiting applications

Sanz, N.; Ibanez, A.; Morel, Y.; Baldeck, P. L.
April 2001
Applied Physics Letters;4/23/2001, Vol. 78 Issue 17, p2569
Academic Journal
Nonlinear absorption and optical-limiting properties of sol-gel glasses doped with nanocrystals of stilbene 3 have been studied. These organic-inorganic nanocomposite materials can be highly doped (up to 30 wt %) with active molecules through the control of nanometer-scale crystallization. In the nanosecond time regime, the nonlinear absorption occurs in a two-step process, which is characterized by two-photon absorption and excited-state absorption spectroscopies. In a F/5 optical system, the output energy is damped below 20 μJ for all visible wavelengths, 6 μJ at λ=600 nm. Thus, these nanocomposite materials are a good alternative both to concentrated solutions, due to their stability, and to crystals, due to their isotropic response with polarization. © 2001 American Institute of Physics.


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