Single-shot digital holography is developed for instantaneous recording of the complex-amplitude inline hologram by
applying spatial heterodyne modulation and spatial frequency filtering. The complex-amplitude in-line hologram can be
precisely extracted from one off-axis hologram for the reference light beam with general spatial phase distribution.
Bandwidth of the complex-amplitude hologram is enlarged up to a half of the spatial sampling frequency by eliminating
the zero-order term from the off-axis hologram, which is a theoretical upper limit in the single-shot recording.
Experimental results show that fine images are reconstructed from the complex-amplitude hologram as a result of
elimination of the direct light beam and the conjugate beam.
A new technology of one-shot digital holography is developed for instantaneous recording of the complex-amplitude
hologram for color three-dimensional images. Three holograms for different phases of the reference light are obtained
both by spatially sampling an off-axis hologram and by interpolating sampled hologram data, and the complex-amplitude
hologram is extracted from these three holograms. The one-shot holography is generalized for recording the hologram
with the reference light having general phase distribution, and the limitation of bandwidth in one-shot holography is also
discussed. Numerical simulation and optical experiment are carried out to demonstrate one-shot recording of the
complex-amplitude hologram. Results show that fine color images with high resolution are reconstructed from the
complex-amplitude hologram as a result of perfect elimination of the direct beam, the zero-order noise and the conjugate
beam. The one-shot digital holography can make possible to record color images of the moving object by adopting RGB
pulse lasers, and to reconstruct moving color images in real-time with the holographic display