Air Force

Synthesis of two-photon absorbing polyhydroxy diphenlamino dialkylfluorene-1,3,5-triazine

High performing chromophores with large effective two-photon absorption cross-sections have been synthesized and characterized for various metrology applications

Materials

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Chromophores as laser dyes for stabilization and calibration

New novel chromophores combined with ultrafast high-intensity lasers has renewed interest in advancing new applications in photonics and biophotonics. The enabling feature is the molecule’s ability to absorb two photons at a low frequency (energy) light source and then emit light at a higher frequency. For instance, near-infrared (NIR) may be upconverted to light in the ultraviolet-visible (UV-vis) region via a two-photon absorption (TPA) process. The energy difference between the involved lower and upper states of the molecule is equal to the sum of the energies of the two photons.

US Air Force R&D lab researchers have designed and synthesized several two-photon absorbers having large cross-section values for various nonlinear optical applications.  These multi-branched two-photon active (TPA-active) molecules can be used in films and coatings using common organic solvents.

Within this portfolio are the following 8 patents available for express license.

  • US patent 8,153,812
  • US patent 8,318,888
  • US patent 8,471,035
  • US patent 8,580,958
  • US patent 8,674,057
  • US patent 8,735,528
  • US patent 8,895,730
  • US patent 9,024,037

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