All Questions
Tagged with optics interferometry
161
questions
4
votes
1
answer
99
views
Small crack in bottom corner of a beam splitter
I'm working with a Sagnac interferometer. To split a laser beam (He-Ne), we are using a cubical, non-polarizing beam splitter from Thor Labs (BS031).
The beam splitter is fastened to a stand that is ...
- 343
2
votes
0
answers
399
views
Phase shifts in different beam splitter designs
I am trying to understand how a Mach-Zehnder interferometer works. It seems that it will work whether we use two beam splitters that consist of either
glass prisms glued together
a sheet of glass ...
- 21
0
votes
1
answer
94
views
Why is the sample interferogram given by the following integral of the intensity pattern?
I am trying to understand equation (2) in the paper by J. E. Greivenkamp with the title Generalized data reduction for heterodyne interferometry from year 1984. If you dont have acces to the article, ...
0
votes
2
answers
75
views
Is $I(\lambda)=I(\tilde{\nu})$ true in general in Fourier Optics?
Say the spectrum of a light bulb is given by $$I(\lambda)=I_0exp\left(-\frac{(\lambda-\lambda_0)^2}{2(\delta \lambda)^2}\right)$$
(i.e. a gaussian)
if I want the intensity in terms of the wavenumber $\...
- 1,047
0
votes
2
answers
160
views
Misconception with Fourier Transforms in a Gaussian Light source?
So for a Michaelson Interferometer , we know that the (complex) interferogram ($I=I(\Delta)$, $\Delta$=path difference between two mirrors) is related to the intensity profile of the light source $(...
- 1,047
0
votes
3
answers
343
views
How can I simulate michelson's interferometer circular fringes?
I wanto to simulate the circular fringes on a screen for the michelson interferometer. I know how to identify if there will be a destructive or constructive interference, but what about the radius of ...
- 1
1
vote
0
answers
47
views
Why do two-beam interferometers have a relatively broad "fringe width" compared to single-beam interferometers?
I recently overheard someone discussing the basics of interferometry setups. They said that two-beam interferometers have a relatively broad "fringe width" compared to single-beam ...
- 889
0
votes
0
answers
37
views
Is it possible to use a distributed camera array to fake an interferometric sensor without phase data?
Astronomical interferometry is a technique which uses multiple small telescopes to mimic one giant telescope. It requires the phase of the light to be captured for it to work. It is widely used in ...
1
vote
1
answer
131
views
Fabry-Pérot-Interferometer: What Reflectivity
Apologizing for that narrow question, but considering such interferometer with mirrors characterized by Reflectivity $R$ and reflection coefficients $r = \sqrt{R}$, where $R$ describes the amount of ...
- 462
0
votes
1
answer
307
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Why do the Fringes in Michelson Interferometer move inward/outward?
We did this experiment using Michelson Interferometer of monochromatic source $\lambda$ to find the refractive index $n$ of dry air in a chamber of length $L$ by counting the number of fringes moved ...
0
votes
2
answers
50
views
Add coherence length factor in source term for light source
I am trying to model the behavior of a Michelson-interferometer driven by a light source with a short coherence length (i.e. some centimeters at max.). By placing transmittive material in one of the ...
- 365
4
votes
3
answers
2k
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I polarize the slits (one H, the other V) of a Young's double-slit. If my source is H or V, do I see fringes? What about if my source is D or AD?
In my journey to understand light better, I build a "polarized Young's interferometer". Imagine the following polarizations: horizontal, vertical, diagonal, and anti-diagonal (H, V, D, and ...
- 117
2
votes
1
answer
515
views
Since a collimated beam is always in focus, can't I simply just emit a collimated beam over the varying distances as the target object moves?
I am designing an interferometer for an experiment. The setup consists of (1) the laser source, (2) the interferometer itself (consisting of optical components and photodetector(s)), and (3) the ...
- 889
3
votes
0
answers
121
views
How does the quality of the reflected light compare to the emitted light? And how do I manage this (reflected) light quality well?
I am designing an interferometer for an experiment. The setup consists of (1) the laser source, (2) the interferometer itself (consisting of optical components and photodetector(s)), and (3) the ...
- 889
0
votes
1
answer
78
views
Do interferometers require equal-powered (or as equal as possible) beams being emitted at the target and the photodetector(s)?
I am designing an interferometer for an experiment. The setup consists of (1) the laser source, (2) the interferometer itself (consisting of optical components and photodetector(s), and (3) the target ...
- 889