Optical systems are susceptible to saturation or damage caused by high power lasers. The major issue is to find a mechanism to protect from laser threats without interfering with the optical system performances. This paper presents a new approach in exploiting the laser energy itself to enable a dynamic response of a protection filter. We discuss an up conversion mechanism in which two or more photons of the threatening laser are absorbed by an up converting molecule following an energy transfer to a molecule that is able to change its absorption spectra and absorb in that laser wavelength range, thus creating a dynamic filter limiting high power lasers while allowing high transmittance for low intensity light.
Ariela Donval, Noam Gross, Eran Partouche, Tali Fisher, and Moshe Oron, "Up converting as a tool for laser protecting smart filters," Proc. SPIE 10627, Advanced Optics for Defense Applications: UV through LWIR III, 106270E (Presented at SPIE Defense + Security: April 15, 2018; Published: 30 May 2018); https://doi.org/10.1117/12.2300985.
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