Why aren't interference filters also polarizers?

In summary, the conversation discusses the properties and efficiencies of interference filters, specifically dichroic filters, in terms of polarizing incident light. It is suggested that these filters have different efficiencies for s- and p- polarization and can somewhat polarize the light, but not to a significant degree. It is also mentioned that it is possible to design filters with high pass efficiencies for both s- and p- states, minimizing any polarization that may occur.
  • #1
Neo_Anderson
171
1
After all, the un-passed light reflects off a transparent medium with a definite index of refraction, right?
HELP!
 
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  • #2
I think the only reason that you don't get significant polarisation is that the light strikes a polarising filter very near the Normal.
 
  • #3
...Well, I did get one answer...

Interference filters are poly chromatic, depending on viewing angle. Polychromatic, but not polarizing in any significant way.

Anyone else?
 
  • #4
The filters I use (dichroics) have different efficiencies depending on the polarization of the incident light (s- or p- polarization), so I expect they can indeed polarize the incident light somewhat. The polarizing efficiency of the dichroic filter is much lower than a polarizer, tho.

It's possible to design filters to have very high pass efficiencies for both the s- and p- states, so they would not induce any large amount of polarization.
 

Related to Why aren't interference filters also polarizers?

1. Why do interference filters not act as polarizers?

Interference filters and polarizers are two different types of optical components that function differently. While interference filters selectively transmit or reflect certain wavelengths of light, polarizers only allow light waves with a specific orientation to pass through. Therefore, interference filters cannot act as polarizers.

2. Can interference filters be used as polarizers in certain situations?

In some cases, interference filters can exhibit properties similar to polarizers, such as blocking certain wavelengths of light. However, this is not their intended function and they may not be as effective as dedicated polarizers.

3. Are interference filters and polarizers interchangeable?

No, interference filters and polarizers cannot be used interchangeably. They have different designs and principles of operation, and therefore cannot be substituted for one another.

4. Is it possible to combine interference filters and polarizers to create a more advanced optical component?

Yes, it is possible to combine interference filters and polarizers to create a device known as an "interference polarizer." This component uses both interference and polarization effects to achieve a more precise control over light waves.

5. Why are interference filters and polarizers both necessary in certain experiments or applications?

Interference filters and polarizers have different functions and can be used for different purposes. In certain experiments or applications, both components may be necessary to achieve the desired outcome, such as filtering specific wavelengths of light while also controlling the orientation of the light waves.

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