Information is recorded in quick response codes. A hologram is made from quick response codes and provides three dimensions of information in a two-dimensional hologram. The holograms are used for recording large amounts of information in two dimensions. Multiple quick response codes containing copious information are created using different light wave frequencies in different quick response encoders. The multiple quick response codes are combined in a two-dimensional hologram that is used on labeling. The hologram is read by a hologram reader. Each quick response frequency layer is separated from the hologram. The quick response code is extracted from each layer. A quick response reader provides the information that has been recorded.

An emitter laser illuminates multiple reflectors each of which produces a unique robust code, with the laser being sequentially moved between illuminating successive reflectors. The reflectors send light to a holographic film, and the laser poses can be associated with the respective codes. Subsequently, an illuminator such as another laser can illuminate the film, and a sensor positioned near the film records what code is produced, so that the code can be correlated to a laser pose with respect to the film and sensor.

A system includes a multiplexed optical identifier and a reader for the optical identifier. The multiplexed optical identifier includes an optical substrate, and a plurality of volume holograms in the optical substrate. The reader includes an illumination source and a camera. The illumination source is configured to direct light into the optical identifier to produce an image of a corresponding one of the volume holograms at the camera, and the camera is configured to capture the image, which is stored in a digital format by the system. The multiplexed optical identifier contains more than one code page, wherein each of the code pages is used for a different purpose.

A hologram module includes a phosphor layer and a rainbow hologram sheet. The phosphor layer has a phosphor array structure. The rainbow hologram sheet has a first display layer and a second display layer. The first display layer is disposed on the phosphor layer and has a first barcode array corresponding to the phosphor array structure. The second display layer is disposed on the first display layer and has a second barcode array corresponding to the first barcode array. The phosphor array structure, the first barcode array and the second barcode array are chromatic. A color of the phosphor array structure meets with a color combined by the first barcode array and the second barcode array so as to display a hologram image converted from light emitted by the phosphor array structure via the first and second barcode arrays.