How does a holographic sight work?

I assume hunting is your favorite free time activity. Suppose you are on hunting trip walking through a rugged mountainous terrain carrying a riffle with a red dot sight mounted on it. You are little careless since you are not expecting to sight any game in this part of the terrain. But all on a sudden you saw deer grazing some distance away. You lose some precious time to aim it. The result is you miss your bounty. And this is where comes holographic sight- a special type of sight that is designed to help shooters aiming and hitting the target quickly. Let's find out how does a holographic sight work?

Holographic weapon sights are getting much popularity in shooters community. The sight allows shooters aiming the target quickly while not aligning the head with the sight. This is a great time saving feature of the holographic sight because in a conventional optical scope, a hunter must align his eye with the scope in order to position the reticle on the target. If the shooter’s head is not aligned with scope, the reticle will not perfectly aim the target. And the result will be missing the target. In a holographic sight the reticle will always be on the target whether you move the gun right or left.
The difference between a conventional scope and the holographic sight is what you see through a holographic sight is not the real target. It is a reconstructed view of the target. And the reticle you see is a projected image of the reticle-not the real reticle.

At this point, I am sure you are confusing enough to gnaw your nail and thinking about how this happens. Let me explain. Do you know the movie camera works? The holographic sight utilizes the same principle of a movie camera. The function of a movie camera is recording the light that is reflected from the scene on to a film. Then the film is illuminated and projected on to movie screen. You see the scene that was recorded earlier.

The holographic sight works in the same fashion.  What happens in holographic sight is light is reflected from the object or target. As you may know light refers to several wavelengths wave patterns. Not a single wavelength or pattern. Each wavelength refers to a specific color. For example, the longest wavelength refers to red color while the shortest one corresponds to blue color. Let’s back to our main discussion. The holographic site encodes the wave pattern reflected from the target and then projects the encoded wave patterns onto a clean window within the holographic sight. A laser is then come into play which function illuminates the wave pattern. The result is a three dimensional view of the target area.

The difference between the movie camera and the holographic sight is as you see everything happens in holographic sight is live. In the movie camera the scene is first recorded on the film. Then  the film is projected on the movie screen. But in holographic sight recording and projecting happens at the same time.