The LBTEK Holographic Data Storage Experimental Teaching System is primarily designed to introduce the photorefractive effect of storage crystals and demonstrate the storage of image information through interference and diffraction characteristics. The mechanism of optical storage can be briefly described as follows: the data or images to be stored are modulated by a two-dimensional spatial light modulator, and the modulated light carries the image information to be stored, commonly referred to as the signal beam (in this experiment, the signal beam is formed by passing the object beam through a patterned film). Another reference beam interferes with this signal beam, utilizing the photorefractive effect of the recording medium (photorefractive crystal or photopolymer) to form a volume hologram, thereby completing the information storage. During reproduction and retrieval, the same original reference beam is used for addressing, allowing the stored object information to be reconstructed from the medium.