All Questions
7
questions
2
votes
0
answers
25
views
How to model the effects of diffraction for a convex lens?
I am using a convex lens in a wavefront-measuring interferometer for testing microscope objectives, where the lens images the exit-pupil of the objective onto my camera. It is my understanding that ...
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1
vote
0
answers
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 ...
- 31
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
2
answers
575
views
How does beam shape (elliptical vs circular/Gaussian) affect interferometry?
I want to understand the importance of beam quality to interferometer systems. This article says the following:
A very high (close to diffraction-limited) beam quality, associated with a high spatial ...
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1
vote
1
answer
354
views
How does the effective focal length work for aspheric lenses? How should I select an aspheric lens?
I am currently looking at aspheric lenses on Thorlabs. I want to use them as a collimation optic for my interferometry experiment. Note that the lenses have a listed EFL (effective focal length). But ...
- 889
1
vote
1
answer
25
views
Interferometry: effect of aspheric lens on self-mixing effect
I want to perform self-mixing interferometry experiments using a laser diode, as was done here. I'm going to use a low-power laser diode. However, I want to improve the performance of the device, ...
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