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全息照相记录和再现影象是建立在光的相干性基础上的衍射影象。作为录象介质的全息照相材料所收录的景物的象,并不是用光学方法形成的,而是景物的光波本身,即收录了景物光波的全部信息。全息照相要求用严格的单色光进行曝光,因此录象介质的光谱感光度应该与所应用的光源的波长相符。最常用的光源波长有6328A氦氖激光、4579～5145A氩激光和6943A红宝石激光。现今感光材料的乳剂实际上能够对大约2200～12500 A之间的任何波长敏感,因而已能为全息照相提供各种特定光谱感光度的照相材料。
Holographic recording and reproduction of images are diffraction images based on the coherence of light. The image of the scene contained in the holographic material as the recording medium is not optically formed but is the light wave of the scene itself, that is, it contains all the information of the scene light wave. Holography requires exposure to strictly monochromatic light, so the spectral sensitivity of the recording medium should match the wavelength of the light source used. The most commonly used light sources are 6328A HeNe laser, 4579-5145A Argon laser and 6943A Ruby laser. The emulsions of today’s photosensitive materials can in fact be sensitive to any wavelength between about 2200 and 12500 A and thus have been able to provide holographic photographic materials of various specific spectral sensitivities.