What is the future of holograms?

Holograms as explained earlier are a kind of method which is a photographic technique that records light dispersed from the object and then presents it in a 3 dimensional or 2 dimensional way. Now how this?3-dimensional hologram?of an object is created in the last post we saw about the?history of the hologram?this time we will be looking through the overall science behind the holograms and the future of the?holograms?as well.

By now we all know that Dennis Gabor was the first to create 3D holograms using a mercury vapor lamp that produces a monochromatic blue light that is filtered and is more coherent than the normal laser used to produce holograms. For this Gabor was awarded the Nobel prize. So now what actually is the science behind this whole hologram producing process.?

How are 3D holograms produced? -??

In holography, red lasers, mainly helium-neon (HeNe) lasers, are prevalent. Some home holography studies use red laser pointer diodes, however, the light from a laser pointer is less coherent and steady, making it difficult to obtain a clear image. Some holograms make use of lasers that emit a variety of hues of light. You may also require a shutter to adjust the exposure depending on the sort of laser you're using.?Although holography is sometimes referred to as "lensless photography," it does involve the use of lenses. The lens of a camera, on the other hand, concentrates light, but the lenses employed in holography spread the beam out. A beam splitter is a device that splits a single beam of light into two beams using mirrors and prisms.?Light rays are directed to the right destinations via mirrors. The mirrors, like the lenses and the beam splitter, must be spotless. The final image might be degraded by dirt and smudges.

The holographic film is a type of film that can capture light at a very high resolution, which is required to make a hologram. It's a translucent surface with a coating of light-sensitive chemicals on it, similar to photographic film. The distinction between holographic and photographic film is that holographic film must be capable of recording minute changes in light across tiny distances. To put it another way, it must have a very fine grain. Holograms that employ a red laser can rely on emulsions that respond well to red light.

Just like in-camera which works like this.

1. The shutter opens.

2. The light passes through the lens and hits the photographic emulsion on the piece of film.

3. A component called silver halide reacts to the light recording to its amplitude, intensity as it reflects off the scene in front of you.?

4. Then the shutter closes.

5. The scene is then brought to you as a picture in front of you.?

The same as the camera this method too produces a piece of film that has recorded the incoming light, just like a photograph. However, when you examine the holographic plate after it has been developed, you will see something unexpected. A camera's developed film gives you a negative image of the original scene, with parts that were light becoming dark and vice versa. You may still get a feel of what the original scene looked like if you look at the negative.?However, there is nothing that resembles the actual scene when looking at a developed piece of film used to create a hologram. Instead, a dark film frame or a random pattern of lines and swirls may appear. The appropriate lighting is required to turn this frame of film into a picture. Monochromatic light shines through the hologram to create a picture in a transmission hologram. Monochromatic or white light bounces off the hologram's surface to create an image in a reflection hologram. The light streaming through or reflecting off the hologram is interpreted by your eyes and brain as a three-dimensional object. Reflection holograms are the holograms you see on credit cards and stickers.?To observe a hologram, you'll need the correct light source since it stores the phase and amplitude of the light like a code. It captures the interference between the reference beam and the object beam, rather than a simple pattern of reflected light from a scene. This is accomplished by a pattern of small interference fringes. Each fringe can be a fraction of the wavelength of the light that created it. It needs a key to decode these interference fringes, and that key is the appropriate sort of light.?

Similar to the camera how holograms are captured -?

1. The shutter moves away from the path of the incoming laser.

2. The light from the object reflects off from the object.?

3. Both the beam come to the point of photographic emulsion and the compounds of it then react to the beam.

4. Shutter blocks the path of the laser beam.

Now we will be looking at how the light creates interference fringes.?