How are holograms possible?

Summary by Krater

This video explains the physics and mathematics behind holography, demonstrating how a 3D scene can be recorded onto a 2D film using interference patterns and reference waves.

From the video

Answers: How do holograms work?

• holography physics
• transmission holograms
• white light reflection holograms
• diffraction gratings
• Fresnel zone plates
• complex numbers in wave optics
• interference and phase

What it concludes

• Holography works by recording both the amplitude and phase of light using interference patterns created by an object wave and a reference wave.
• The exposure pattern on the film for a single point is a Fresnel zone plate, which acts like a diffraction grating when illuminated by a reference beam.
• Shining a reference wave through a developed transmission hologram reconstructs the original object wave along with a conjugate image.
• High-resolution film capable of recording thousands of lines per millimeter is required to capture the fine interference fringes needed for holography.