Optical system for recording or replicating hologram

摘要: The invention provides a hologram recording or replicating optical system wherein misalignment-with-time of the center laser generated beam is automatically corrected so that color balance in surface, for instance, can be well maintained with no disturbance. In irradiating photosensitive material 20 from 31 through pinhole 10, position correcting mechanism 32 and splitter 33 are located an path between 10 , detector 35 at split by conjugate to operated on basis error signal obtained keep incident always constant.