All Questions
14
questions
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When building a fiber optic interferometer what methods are used to reduce microphonic effects?
When building a fiber optic interferometer what methods are used to reduce microphonic effects? I'm familiar with a few methods such as: enclosing the interferometer under a sound dampening cover, ...
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0
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30
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Are there any commercially made optical fibers which are made specifically to have very low microphonic properties for application in interferometry
Are there any commercially made optical fibers which are made specifically to have very low microphonic properties for applications in interferometry. While building a fiber optic interferometer I ...
- 240
1
vote
1
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66
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Why laser output power fluctuates after passing through two 1x2 fiber optic couplers?
When laser source is launched into two 1x2 50/50 fiber optic couplers connected as below the output power constantly fluctuates in range of 70 uW.
The fluctuation happen roughly one to two times per ...
- 240
1
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0
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36
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Which method of laser diode operation is less likely to cause mode hopping: constant current or constant power?
If a laser diode is uncolled and operates in a CW mode then which method of operation is less likely to cause mode hopping: constant current or constant power?
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1
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1
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56
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Why fiber optic Sagnac interferometers don't produce multiple interference fringes
I have seen a few Sagnac fiber optic interferometers however, those that I've seen don't produce multiple fringes but rather just one luminant dot with varying intensity. Even if a beam expander is ...
- 240
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22
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Explain laser stability and interferograms relationship
I am using a Twyman-Green interferometer to record phase-stepped interferograms. The interferometer uses a monochromatic diode laser (visible light). As you observe the interferogram on the screen, ...
- 31
1
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0
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31
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Fringe pattern and ripples in the fringe visibility plot from interferograms
I am using a lens testing interferometer, where I record 4 to 5 interferograms with a 90$^{\circ}$ phase step between consecutive interferograms. In addition to the interferometer, I have also created ...
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4
votes
1
answer
99
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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
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3
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126
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Regarding Michelson's interferometer
In Michelson's Interferometer (1881 experiment), even though the arm length for both the perpendicular arms was taken as the same (say $L$) and a compensatory plate was used to removed optical path ...
1
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1
answer
872
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Michelson Interferometer - Lab question [closed]
I do the Michelson Interferometer experiment in the University lab and I have some questions.
If I block one arm, Why the oscillation of the spectrum disappear? What represent the graphic (like a ...
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4
votes
1
answer
205
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Michelson interferometer finding $\frac{\Delta \nu}{\bar \nu}$?
Let us say we send light with wavenumber $\bar \nu \pm \frac{\Delta \bar \nu}{2}$ through a Michelson Interferometer. Using the intensity at the center of the interference pattern $I(x)$ (where $x$ is ...
2
votes
3
answers
9k
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How to measure an image's contrast?
I'm studying Fourier optics and Interferometry and I intend to determine the contrast of an image using computer software. My teacher of Experimental Physics didn't tell me how to do it, and so, I'm ...
- 1,082
7
votes
4
answers
2k
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Explanation of Michelson Interferometer Fringe Shift
I have been working on an experiment where 2 glass microscope slides are pinched together at one end (so that there is a "wedge" of air between them) and placed in the path of a laser in one leg of a ...
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4
votes
2
answers
2k
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Misaligned Mirror on Michelson Inferometer
If one of the outer mirrors on a Michelson interferometer was to be misaligned by a small angle of theta, what would be the shape of the interference pattern in the detector plane? What would happen ...
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