Path difference in Fabry-Perot etalon

In summary, the conversation discusses the Fabry-Perot etalon and its use in an experiment related to the Zeeman effect. The question asks about the path difference in the etalon and the equation for it, while the response explains that there is also an outside OPD that must be subtracted. A link to more information is also provided.
  • #1
hadoque
43
1
Hi
I'm trying to understand how the Fabry-Perot etalon works for an experiment regarding the Zeeman effect.
Looking at the image could anyone tell me why the path difference in the etalon is [tex]\Delta l = 2t \cos{\theta}[/tex]? In my head, the path difference is [tex]\Delta l = 2t/\cos{\theta}[/tex], in other words, just the length of two more reflections.
 

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  • #3
Wow, I posted that question two years ago. Thanks for taking the time to answer it though.. :)
 

Related to Path difference in Fabry-Perot etalon

What is path difference in Fabry-Perot etalon?

Path difference in Fabry-Perot etalon refers to the difference in distance that light travels between the two mirrors of the etalon. This difference in path length causes interference patterns to form, which can be used for various applications such as measuring the wavelength of light.

How is path difference calculated in a Fabry-Perot etalon?

The path difference in a Fabry-Perot etalon is calculated by taking the difference in the optical path lengths between the two mirrors. This can be determined by multiplying the refractive index of the medium between the mirrors by the physical distance between the mirrors.

What factors affect the path difference in a Fabry-Perot etalon?

The path difference in a Fabry-Perot etalon is affected by several factors, including the thickness and refractive index of the medium between the mirrors, the angle of incidence of the light, and the reflectivity of the mirrors. Additionally, any changes in these factors can alter the path difference and therefore affect the interference pattern produced by the etalon.

How is path difference used in Fabry-Perot etalons for sensing applications?

Path difference is used in Fabry-Perot etalons for sensing applications by measuring the change in the interference pattern caused by any slight changes in the medium between the mirrors. This change can then be used to detect and measure various properties, such as pressure, temperature, or refractive index, depending on the application.

What are the limitations of using path difference in Fabry-Perot etalons?

There are a few limitations to using path difference in Fabry-Perot etalons. These include sensitivity to changes in environmental factors, such as temperature and pressure, as well as limitations in the range of measurable changes in the medium. Additionally, the accuracy of the measurement may be affected by imperfections in the etalon mirrors or any misalignment between the mirrors.

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