Fabry-perot Definition and 18 Threads

  1. M

    I Angular stability of a Fabry–Pérot cavity

    Hello! I am designing a two-mirror cavity for an experiment. For the properties I need, I ended up using a 9.8 cm long cavity, with the 2 mirrors both having a 5 cm radius of curvature. Using Gaussian beam propagation formulas, I can easily compute most of the parameters I need (e.g., behavior...
  2. Daniel Petka

    I Can a single photon of a single frequency pass through a FP cavity?

    I was watching this amazing video about FP cavities and the creator mentioned that a single photon shouldn't pass through that cavity. Only multiple photons can. This doesn't make sense to me. The cavity works thanks to interference and single photons still interfere with themselves, so...
  3. Daniel Petka

    I Does a Fabry Perot cavity charge in discrete steps?

    I'm trying to understand the Fabry Perot interferometer and came across this amazing video. Basically it all comes down to adding E-fields together with each of them being delayed by the cavity round trip time. In the extreme case, either they all interfere constructively at the second mirror...
  4. dykuma

    I Fabry-Perot Interferometer mirrors

    I am trying to build a Fabry-Perot interferometer to make some narrow band filters, and I was wondering if anyone can go into the specifics of whether there's anything special about the types of mirrors used in construction. I started by trying to see how hard it really is to make one on my...
  5. B

    Correct Angle for FSW in Fabry-Perot Interferometer

    Sorry for the lack of formatting, I'm in a rush to write this before I go pick someone up from work. My question is what is theta1? Is it 45 degrees because that's the angle the light hits the boundary of the plate to the n1 medium? Or is it 0? It seems like it should be 45 but there's an...
  6. U

    Methods for capturing a Fabry-Perot Interference Pattern

    I'm planning on doing an (undergraduate-level) experiment to study Zeeman Splitting in Cadmium. There's no complete set of instructions for the lab, but after seeing the materials, it appears that I will attempt to use a cylindrical Fabry-Perot Etalon to resolve the wavelength differences...
  7. M

    I Gaussian beam in a Fabry-Perot interferometer

    Hello I am reading some introductory laser cavity stuff and I am a bit confused about the existence of gaussian beams in the Fabry-Perot interferometer. If you solve the stability condition for a cavity (i.e. asking for the q parameter to reproduce itself after one round trip) you get that in...
  8. Aurora_b

    Circular fringes in a Fabry-Perot Interferometer

    Fabry-Perot Interferometer contains an etalon(an optical cavity created by 2 partially reflective mirrors placed parallel to each other separated by a small distance). When light enters the etalon it gets reflected back and forth between both the mirrors, being partially reflective, every time...
  9. H

    I Understanding the transmission of an etalon

    Hi there, I have a question concerning the etalon (One would think that I find an answer for this in every standard physics textbook or this forum, but I actually did not): An etalon can be built from a solid block of glas (for example) with dielectric high reflectivity coatings (let's say R=99...
  10. Charles Link

    Insights Fabry-Perot and Michelson Interferometry: A Fundamental Approach - Comments

    Charles Link submitted a new PF Insights post Fabry-Perot and Michelson Interferometry: A Fundamental Approach Continue reading the Original PF Insights Post.
  11. A

    Mutilple beam reflection question in Fabry-Perot cavity

    Homework Statement Just having some trouble with a question about Fabry-Perot intereferometers. Here's the question: a) Consider a beam of light undergoing multiple reflections in a Fabry-Perot cavity between two surfaces, both with reflectance R, and with no absorption. Homework Equations...
  12. H

    Calculating Refractive Index Using Fabry-Perot Interferometer

    Homework Statement A Fabry-Perot interferometer has spacing d = 2 cm between the glass plates, causing the direct and doubly reflected beams to interfere. As air is pumped out of the gap between the plates, the beams go through 23 cycles of constructive-destructive-constructive interference...
  13. N

    Tunable Fabry-Perot interferometer

    Hi all. I am trying to understand how a tunable Fabry-Perot interferometer works. This is what I have understood so far: An etalon is placed inside a pressure vessel, and the pressure inside this chamber is changed. Apparently, this changes the "effective optical path length" between the two...
  14. H

    Path difference in Fabry-Perot etalon

    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 \Delta l = 2t \cos{\theta}? In my head, the path difference is \Delta l = 2t/\cos{\theta}, in other...
  15. T

    Solving Fabry-Perot Problem: Increase L by \lambda/2 to Scan FSR

    Homework Statement Show that it is only necessary to increase the distance L between two mirrors of a Fabry-Perot cavity by a distance \lambda/2 to scan the transmission peak over a range of one FSR Homework Equations The Attempt at a Solution D=2L*sqrt(1+v^2/c^2)
  16. Math Jeans

    Fabry-Perot interferometer diffraction

    Homework Statement A Fabry-Perot interferometer consists of two parallel half-silvered mirrors separated by a small distance a. Show that when light is incident on the interferometer with an angle of incidence \theta, the transmitted light will have maximum intensity when a = (\frac{m \cdot...
  17. cepheid

    Fabry-Perot Cavity: Energy and Round Trip Phase Dynamics

    Hi, I know this is dumb question, and I should be able to figure it out and move past it, but I can't. The optics book I have begins its treatment of Fabry-Perot cavities by considering the case of an undamped optical resonater (perfectly reflecting mirrors). Here's a quote from it: If that...
  18. S

    Fabry-Perot Interferometer: Energy Conservation

    Homework Statement This is regarding a Fabry-Perot Interferometer with identical mirrors: If you shine a beam of light on a 99% reflecting mirror, 1% goes through and the other 99% is reflected. But if a second mirror is placed behind the first one, where there is only 1% of the light...
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