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  • Dynamic Multiple Wavelength Filter Using Holography in a Stratified Volume Holographic Optical Element of Photorefractive Gratings

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  • This invention describes a dynamic, multiple-wavelength filter developed from a Stratified Volume Holographic Optical Element (SVHOE). The photorefractive SVHOE is a multi-layer structure containing a series of grating layers, buffer layers and transparent electrodes. Through selective activation of the electrodes, the diffraction of light can be controlled so that only predetermined wavelengths are transmitted. Thus, the device serves as a high resolution filter capable of selecting one or several wavelengths from an incident beam with a broadband spectrum. In addition, since the electrodes can be activated in multiple configurations, the device serves as a dynamic filter, where electrical conditions can be tuned to provide the desired optical filtering properties.