BAE Systems PLC
Filter for laser protection

Abstract:

A method of forming a filter, comprising the steps of: --selecting at least a first wavelength corresponding to a predetermined laser threat and having a first colour in the visible spectrum; --providing a generally transparent substrate and forming a first notch filter region therein configured to substantially block incident radiation thereon of wavelengths within a first predetermined wavelength band including said first wavelength; --selecting a second wavelength having a second colour in the visible spectrum and forming a colour balancing notch filter region in said substrate configured to block incident radiation thereon of wavelengths within a wavelength band including said second wavelength, thereby to balance or neutralise any colour distortion of said substrate caused by said first notch filter region.