Nondestructive readout of volume hologram by use of the broadband light source

In this paper, we propose another way to reconstruct the image from the volume hologram at a different wavelength. Our method utilizes a spectrally broad but spatially coherent light for the probing beam. The paper illustrates the record and readout scheme of our proposed method. In the recording process, the monochromatic signal beam bearing the image information passes through a Fourier transform lens, and records the Fourier hologram in the ordinary way. In the readout process, the collimated probing beam with the broadband spectrum is incident on the crystal at an appropriate angle. Each angular spectral component of the grating can be Bragg-matched at one particular wavelength within the broadband spectrum of the probing beam. Finally the diffracted waves image onto the detector dispersively and reproduce the input image.