Very small holographic laser projectors and diffraction.

In summary, the conversation discusses the concept of creating a feasible invisibility cloak, holographic disguise, or perfect hologram room. The proposed method involves projecting a light beam onto a device that can refract or reflect it in a specific direction, with the use of a camera that also has diffraction-limited performance levels. However, a potential issue arises when the object being hidden or deceived is larger than the reflector or lens size, resulting in a less realistic appearance. The question is whether there is a way to correct or mitigate this issue, and if using larger projector cells would work better or raise suspicion. The conversation also considers other potential challenges, such as the cost and technical requirements of merging a camera with a laser projector and powering a
  • #1
In thinking about what it would take to make a feasible invisibility cloak or holographic disguise or perfect hologram room, I've imagined something that works like this:

A light beam "image" is projected onto a device designed to refract or reflect it in all directions, but only 1 color in any given direction. A camera is also built in using the same lens and the camera also reaches diffraction-limited performance levels.

The problem I'm imagining, is that if the pupil or telescope or whatever that I'm trying to hide from or fool or entertain with ultra-realistic 3D images is larger than the reflector or lens size, the beam will not be diffraction-limited and thus will look like a person-shaped or plane-shaped or tank-shaped blur from, say, a sniper scope or spy satellite or someone with good eyes.

On the other hand, if the cells are too big, the fact that some of the light is coming from the wrong angle and being simplified into pixels and such becomes clear.

My question is:

Is there any way to correct this or mitigate it? Would large projector cells actually work fine and look perfect to smaller pupils and not be suspicious and I'm just being paranoid? Is there another issue (besides things like how expensive it would be to merge a camera with a laser projector and have both of them be at nearly diffraction-limited performance and completely coat a large object in them and power it somehow)
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  • #2
Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

Related to Very small holographic laser projectors and diffraction.

1. What is a very small holographic laser projector?

A very small holographic laser projector is a device that uses laser beams to create a three-dimensional image or video in mid-air. It works by projecting a series of laser beams onto a diffraction grating, which then diffracts the light to create a holographic image that can be viewed from multiple angles.

2. How does a holographic laser projector work?

A holographic laser projector works by using a laser source to generate coherent light. This light is then directed onto a diffraction grating, which splits the light into multiple beams. These beams are then reflected and diffracted to create a holographic image that appears to be floating in mid-air. The image can be viewed from various angles, giving it a three-dimensional effect.

3. What are the applications of very small holographic laser projectors?

Very small holographic laser projectors have a wide range of applications, including entertainment, advertising, and education. They can be used to create eye-catching displays and advertisements, as well as enhance educational experiences by creating interactive holographic models and simulations.

4. Are there any limitations to using very small holographic laser projectors?

One limitation of using very small holographic laser projectors is that the projected image may be dimmer and less detailed compared to traditional projectors. This is due to the diffraction process, which can cause some light to be lost. Additionally, the viewing angle may be limited, making it important to position the projector correctly for optimal viewing.

5. How does diffraction play a role in very small holographic laser projectors?

Diffraction is a key process in very small holographic laser projectors. It is the phenomenon by which light waves bend and spread out when passing through a small opening or around an obstacle. In holographic projectors, a diffraction grating is used to split the laser beams into multiple beams, which are then diffracted to create the holographic image. Without diffraction, the holographic effect would not be possible.

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