Analyzing the difference of atom hologram and optical hologram, we point out that only the laser cooling atoms can satisfy the coherent and diffract conditions required by the hologram technology.

One of the key technology in coherent optical communication system is how to restrain polarization noise of the optical system.

Coherent optical beam formation is a new wideband radio frequency beam-forming technology, which is based on optical interference, diffraction principle and optical Fourier transformation.