Achromatic Volume Holography Using Dispersive Compensation for Grating Tilt.

摘要

In this Letter a method is described for recording volume holograms of an object illuminated by many frequencies. While several ways are known to design systems that are achromatic for thin holograms, we are concerned here with designing systems that are achromatic for recording and reading volume holograms. Volume holograms are of interest for their high diffraction efficiency and ability to be realized in real time using nonlinear optics for image reconstruction, distortion compensation, and phase conjugation. Although, as is shown below, the method described here may be used for more general recording media, this Letter is written in terms of real-time holography in photorefractive crystals. A method for achromatic volume holography is described using a combination of material and grating dispersion. With barium titanate as the dispersive material, a bandwidth of 250 nm is realized. The device may be used for broadband phase conjugation and image reconstruction. Reprints. (aw)