Optical Enhancement of Two-Photon Absorption Process

Patent Status: 

Patent Filed

Indian Patent Applicaton No: 

704/DEL/2008

Department: 

Overview: 

Method of enhancing two-photon absorption cross-section irrespective of molecular characteristics by simply changing the phaseordering within a laser pulse.

Key Features: 

  • The method includes.
  • Providing a substrate having a two photon absorption property o Providing a laser source capable of emitting femtosecond laser pulses.
  • Providing a laser source capable of emitting femtosecond laser pulses.
  • Linearly chirping the laser pulses and characterising the linearly chirped laser pulse.
  • Subsequently a substrate having two-photon absorption properties is excited with this linearly chirped pulse in a controlled manner to achieve an optimum enhancement of the two-photon absorption of the substrate.

Applications: 

  • Two-photon imaging.
  • Optical limiting.
  • Two photon photodynamic therapy etc.

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