In order to get the hologram which has the high diffraction efficiency and low noise, the bleached phase hologram was made. According to the ways of the bleaching the holograms, they were turned black and their diffraction efficiency was decreased as ...
In order to get the hologram which has the high diffraction efficiency and low noise, the bleached phase hologram was made. According to the ways of the bleaching the holograms, they were turned black and their diffraction efficiency was decreased as time elapsed.
To solve theese problems;
1) The recording parameters of the holography were studied.
2) The stability of the holograms was studied.
3) Good results were obtained with the application of the negative feed back method in order to eliminate the intermodulation noise.