Method for producing holographic optical element comprising primary and complementary holograms and associated methods for establishing authenticity of element used as security device

1. Field of the Invention A method is provided for producing a holographic optical element that is comprised of at least one primary hologram (as defined herein) and at least one complementary hologram (as defined herein). The holographic optical element is useful as a security device, since it is relatively easily produced and yet is uncopyable in total. Also disclosed are methods for establishing the authenticity of the holographic optical element.