All Questions
Tagged with optics diffraction
515
questions
2
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41
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Why is the 0-order Maxima so wide for a single slit diffraction pattern?
When looking at the graph of single or double slit diffraction graph, I noticed then for single slit the 0 ordered Maxima is twice as wide as compared to the other nth order Maxima. However, for ...
-1
votes
1
answer
89
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Are hydrogen lamps coherent?
Those hydrogen or mercury tubes should not be coherent, but when looking at them through a grating without using a small aperture in front of the tube, you still see the discrete lines. Or just any ...
- 313
1
vote
1
answer
69
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Fermat's principle of least time confusion
The link is: https://www.feynmanlectures.caltech.edu/I_26.html#Ch26-F3
Hi, I'm reading Feynman's lecture on Optics: The principle of least time, and I'm wondering if I got what he's saying right. For ...
- 13
0
votes
1
answer
129
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Intensity of central maximum for a diffraction grating
If I send a typical 5 mW, 532 nm laser pointer beam through a diffraction grating (~1,000 slits/mm), then I'd expect the beam to cover something like ~1,000 slits. The resulting intensity of the ...
- 303
0
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0
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26
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Near-field diffraction
I want to calculate near field diffraction loss due to the presence human blockages which are modeled as cylinders with random heights and diameters in indoor mm wave network
as mentioned in " ...
13
votes
2
answers
183
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DIY Spectrophotometer doesn't work properly in the IR range
I've built an optical spectrometer by following the instruction given on the Theremino website: Theremino_Spectrometer_Construction.pdf, but I'm having a little issue with it.
Everything works ...
- 321
2
votes
0
answers
25
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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 ...
- 31
1
vote
0
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58
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Refraction and diffraction [closed]
Huygens principle. can we accordingly define refraction to be diffraction from an infinitesimal length slit?
According to Huygens principle, sticking to classical physics terms. as long as slit ...
- 136
0
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0
answers
51
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FDTD solution vs fresnel equation solutiom for reflectivity
I am comparing reflectance intensity of silicon structure with a hole.
I am getting oscillating solution for 0 roughness factor in equation based model, but the spectrum shape of FDTD and equation ...
- 1
4
votes
2
answers
887
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Intuitive way to understand diffraction
My textbook states that when the diffraction gap is smaller, there is more spreading of the waves. However, it seems unintuitive to me, since why would waves spread less if there is more space for it ...
- 193
0
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42
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Geometrical optics - phase considerations
I pasted the whole fragment from the book "Teaching Physics by Laurance Viennot". I generally understand this fragment. However, I am not sure if I understand what author means by the phase ...
- 291
0
votes
1
answer
862
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In single slit diffraction, why does the minima occur at integer multiples of lambda, which is contrary to double slit?
Single slit diffraction is also a kind of interference, so why does the minima do not occur at a path difference with half the wavelength, but occur at integer multiples? In my lecture notes, it says ...
- 73
0
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0
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44
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Far-field analytical solution
I want to compare FDTD far-field solution for reflective diffraction with analytical solution.
It seems more complicated than transmission diffraction.
Please suggest resources or codes for reference.
0
votes
1
answer
131
views
What's the diffraction pattern for free-space propagation plus a thin lens at arbitrary distances?
I am trying to analytically solve the light propagation for the following case:
Starting complex field $E_0$
Fresnel ropagation for a distance $d$ to a lens
Lens applies phase modulation with focal ...
- 93
1
vote
0
answers
51
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Babinet's principle
I am reading a paper on creating ponderomotive traps for neutral atoms.
The setting is that we consider the far-field (Fraunhofer) diffraction pattern of the input field
$$E_i(\rho) = A_0 e^{-(\rho^2/\...
- 93