<title>Hologram authenticity test device</title>

Abstract

Comparative study of existent hologram authenticity test devices shows that these devices don't satisfy demands of nowadays. We propose new optical arrangement of the device, reduces some disadvantages of previous ones. We are proposed the optical arrangement of the device to include semiconductor laser, collimating lens, hologram frame, phase mask. objective, and screen. Laser and collimating lens provide collimated beam incidence to the hologram in the frame. The reconstructed wave front directs to the screen through the phase mask and objective. The phase mask is a positive lens matrix. These lenses may be placed in orthogonal, or in hexagonal, or in another order. The objective front main plane and lenses back focal plane are the same. Therefore, light beams will be homocenterical at that plane. Because of finite lens size hologram placement tolerance increases without reconstructed image disappearance. This device may be used for testing authenticity of paper documents, shares, and goods with protection holograms.