Method of Bragg Angle Adjustments for Copying Holograms.
DEPARTMENT OF THE ARMY WASHINGTON DC
Pagination or Media Count:
A method of copying holograms wherein the process of contact copying of holographic optical elements provides a copy plate for readout at a specific wavelength different from the original wavelength. The original or master holographic element is manufactured at one established wavelength. The copying process involves contact printing using coherent illumination in actinic light at an established second wavelength, and the finished copies are to be read out at a third wavelength. The third wavelength or readout frequency lies in a range where the copy plate is not sensitive to development or recordation and is consequently excluded from routine photographic manufacture. Author
- Lasers and Masers