# Fabry Perot Interferometer

1. Jan 31, 2014

### ayesha203

Design a Fabry perot interferometer, that provides a transmission of T =1 for light with λ1 = 499nm under orthogonal incidence and a transmission for λ2 = 500nm of T≤0.01 (without any further maxima in between). How big has to be the finesse?

Draw the transmission curve of several Fabry - Perot interferometer with this particular geometry (i.e. the same optical path length) for different finesse - values of F-1, 10 and 100 in the range from 498 nm to 501nm.

2. Jan 31, 2014

### BvU

hello Ayesha,

Welcome to PF. You have seen something come by that looks like

Increase your chance to get a response!
• Use the template provided
• You must show your attempt at solving the problem
• Write the text of the problem here, not in an attachment or an image.
• Use an interesting and descriptive multi-word title
• Be comprehensive and clear with your message
• Be friendly and courteous
• Use correct spelling and grammar

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

You have done your best at 1.) and it's quite understandable. The deal is that you help us helping you by providing some hints as to where you are and where you have difficulty by using 2. and 3. The basic idea of PF is that you are done a bad service if someone else does your homework, but that you can learn a lot with a few questions and hints.
Good luck!

3. Jan 31, 2014

### ayesha203

I have tried to solve the above question in the following way:

T = 1 for λ1 = 499nm

T ≤ 0.01 for λ2 = 500nm

for orthogonal incidence : Δs = 2nd, n = 1

Δs = m (λm)

m=1; n=1

d= λ1/2 = 249.5 nm

and i couldn't solve further...