Dichromated poly(acrylic acid) films with dimethyl formamide have been
used as a real-time recording medium for volume transmission hologram
s. In this study a simple computer-generated holographic grating with
a sinusoidal amplitude profile is copied onto this recording material
by the contact-copying technique. The experimental setup for the conta
ct copying of a computer-generated hologram (CGH) is explained, and th
e phase modulation is observed for a different exposure time. Theoreti
cal and experimental diffraction efficiency values for the CGH copy ar
e also evaluated. Photographs of the original and copy of the CGH on t
he photopolymer film are presented.