How to change the polarization of the light

In summary, one can use a half wave plate or quarter wave plates made of birefringent materials to change the direction of polarization of laser light. These materials are also known as "optically active" or "birefringent" and can rotate the plane of polarization due to their molecular structure or stress. Examples of such materials include plastic items like protractors, cellophane, and Scotch tape, as well as the mineral mica.
  • #1
chenhon5
18
0
Is anybody knows what kind of equipment or lens can be used to change the direction of the polarization of the laser light (electrical field and magnetic field, but not the direction of the light)? Thanks.
 
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  • #2
You can use a half wave plate to rotate the polarization of linearly polarized light. Also you can use quarter wave plates to convert linearly polarized light to circularly polarized light and vice versa. Both usually consist of some birefringent material.
 
  • #3
Some materials are called "optically active" or "birefringent", and they rotate the plane of polarization of light passign through them, because the molecules have some spiral pattern or the molecules have been subjected to some stress. I saw an instructor do demonstrations passing polarized light through several plastic items: a plastic protractor, cellophane, and Scotch tape. He also said that mica is an optically active mineral.
 

1. How can I change the polarization of light?

There are several ways to change the polarization of light, including using a polarizing filter, passing light through a birefringent material, or using an electro-optic modulator. The specific method will depend on the desired outcome and the properties of the light source.

2. Why would I want to change the polarization of light?

Changing the polarization of light can be useful for a variety of applications, such as reducing glare or increasing contrast in photography, controlling the direction of light in optical devices, or studying the properties of light in research.

3. Can any type of light be polarized?

Yes, all types of light, including natural light and artificial light sources, can be polarized. However, the degree of polarization may vary depending on the source and the method used to change the polarization.

4. Is it possible to change the polarization of light after it has been emitted?

Yes, it is possible to change the polarization of light after it has been emitted. This can be achieved through the use of various materials and devices, such as polarizing filters or liquid crystals, that can alter the orientation of the light's electric field.

5. Can the polarization of light be reversed?

Yes, the polarization of light can be reversed by passing it through a polarizing filter at a different angle or by using a device like a quarter-wave plate that can convert linearly polarized light into circularly polarized light and vice versa.

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