Passive optical limiter having nonlinear material
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United States of America Patent
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Jul 24, 2012
Grant Date -
Aug 26, 2010
app pub date -
Feb 17, 2010
filing date -
Feb 24, 2009
priority date (Note) -
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Abstract
The invention relates to a passive optical limiter having a nonlinear material capable of switching in a predetermined optical band from a transparent state to an opaque state as a function of the power of an incident laser beam. The nonlinear material is an organic dye which comprises molecules derived from 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene into which a nitrogen atom is inserted at the meso position, referred to as aza-bodipy molecules, and which have conjugated π chains functionalized so as to exhibit absorption for two photons around an incident beam wavelength lying between 1.45 μm and 1.6 μm.
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