Electronically Change Material Refractive Index

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Discussion Overview

The discussion centers on the electronic alteration of material refractive index, particularly exploring the Kerr effect as a potential method. Participants inquire about suitable materials and existing applications in modern devices.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Grheee questions whether the Kerr effect is the appropriate method for electronically changing refractive index and seeks recommendations for materials and devices that utilize this effect.
  • One participant suggests that the Kerr effect could be a viable option and points to clear organic liquids as potential materials.
  • Another participant shares an experience with the GE Talaria projector, which uses an oil film to create an adjustable lens, suggesting it as an example of technology that modulates optical properties.
  • A later reply emphasizes the need to refocus on the topic of voltage-controlled refractive index and asks Grheee to clarify the specific application or goal behind needing a variable refractive index, such as changing focal length or light polarization.

Areas of Agreement / Disagreement

Participants express varying degrees of interest in the Kerr effect and its applications, but there is no consensus on the best materials or methods. The discussion remains unresolved regarding the specific needs and applications for changing refractive index.

Contextual Notes

Participants have not fully defined the assumptions behind their inquiries, and the discussion includes references to historical technology that may not directly relate to current applications.

Grheee
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Hi,

How do I electronically change material refractive index? Is Kerr effect the right way? Is there any good material that have Kerr effect, that can be used in modern gadgets? Is there any gadget/device that use this kind of material?

Thanks:)

Regards,
Grheee
 
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I had a brief encounter with a GE Talaria projector , one of the more amazing gizmos i ever encountered.
It modulates the shape of an oil film to make an adjustable lens for projecting TV signal on to a huge screen.
https://en.wikipedia.org/wiki/Talaria_projector
The later LV series had an optional "Multiple Personality" (MP) module that would allow the projector to display various resolutions and scan rates produced by computers of the time. It could produce an 8,000 lumen image onto a 15 foot by 20 foot screen from 64 feet away.[5]
 
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jim hardy said:
I had a brief encounter with a GE Talaria projector , one of the more amazing gizmos i ever encountered.
It modulates the shape of an oil film to make an adjustable lens for projecting TV signal on to a huge screen.
https://en.wikipedia.org/wiki/Talaria_projector

GE had a knack for making amazing things that remained rather obscure. I had the privilege of working several years underneath the sign in the video below. It was controlled by a magnetic amplifier. GE made exciters using magnetic amplifiers but many engineers have never heard of them.

The lights on the sign were ordinary incandescent light bulbs. The secret of the sign that we GE engineers knew about was that there were two signs at opposite ends of the park, and that the magnetic amplifier controlled them so that the pair drew constant total power even though the lights went off/on. That was a good trick in the 1920s or 30s when it went up without relays or moving parts. I suspect that the sign is replaced with LEDs today.



The GE sign's rival for fame was the RCA Victor "His Master's Voice" dog 20 miles down the road in Albany.
5241321256_279be29486_b.jpg
rca.png
 
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As fascinating as magnetic amplifiers are, we need to get back to the topic of voltage controlled RI ...
Grheee: What are you really trying to do here that needs a variable RI ?
Do you want to change a focal length, refraction angle, or maybe modulate the polarisation of light ?
 

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