Laser Holography... Virtual reality

Human beings are using pictures and painting to preserve their memory either in digital form or in painting forms. We all have seen the creation of digital images in various Display Devices but most of the devices are using several lenses for the creation of images/pictures. Today we are going to explain the technology that is unique in this sense. This technique is not using any lens to build photographic images. It is a Laser Holography technique. Let’s brief the science behind this.

What is Laser Holography?

The term holography is self-explanatory, means of creating a unique photographic image without using any lens. The principle of holography was discovered by Hungarian electrical engineer Dennis Gabor. Gabor considered the possibility of improving the resolving power of the electron microscope. For this, he followed two steps, first by utilizing the electron beam to make a hologram of the object and the second is examining this created hologram with a beam of coherent light like LASER.

Holographic projection by smart phone

Holographic projection by smart phone

The engineering behind Laser holography and working process:

In the Gabor original hologram model hologram was a record of the interference between the light diffracted by the object and a collinear background. The main problem with this model was creating three-dimensional realism in photographs. To solve this issue it is necessary that the light emitting from the source must itself be photographed. If the waves of the streaming light, with their multiple amplitudes of fast-moving crests and troughs, can be stopped or frozen for a movement and photographed, the wave pattern can then be reconstructed and will exhibit the same three-dimensional (3D) pictures as the object from which the light is reflected.  The Holography accomplishes such a reconstruction by recording the phase and amplitude content of the reflected light waves of the light source. This light source is a LASER. The coherent and monochromatic nature of LASER light makes it useful for holography.

There are multiple processes to make a hologram of any object by using LASER light. Some of them are given below:

Continuous-wave laser holography:

This method uses a continuou