All Questions
Tagged with optics diffraction
515
questions
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2
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189
views
Diffraction limit PSF and angular spectrum method?
I know from the angular spectrum method that given a field $U$ with a wavelength $\lambda$, we can decompose it with Fourier transform.
\begin{equation}
U(x, y,0) = \int \int {\tilde{U}_0(f_x,f_y)} ...
- 444
0
votes
1
answer
305
views
Imaging a diffraction grating as it passes through a lens' focal point
I am trying to understand the image created when a coherent light source is incident on a diffraction grating as it is swept through the focal point of a lens. The situation is illustrated in the ...
2
votes
0
answers
85
views
What will I see if I look through a diffraction grating? [closed]
The problem comes from a past exam, which is apparently causing a lot of
confusion between my classmates and teacher. I'll put a slightly paraphrased
version here:
Light of a single wavelength from ...
- 21
0
votes
1
answer
30
views
Evanescent field, condition of $z$ component of $k$?
I am studying evanescent field and diffraction limit and I have one question.
Given a field $ U(x,y,0)$ we can decompose into 2D plane waves.
$U(x,y,0)= \int \int dk_x dk_y \tilde{U}(k_x,k_y) e^{+i(...
- 444
1
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0
answers
38
views
What is the particle physics level description of corresponding optical diffraction of light?
At the particle physics level, what is responsible for the so called diffraction of light in optics thematic of general macroscopic physics ?
11
votes
1
answer
276
views
Unexpected laser pattern through calcite crystal
I've bought a calcite crystal and tried to see birefringence by shining a laser through it.
I get a split spot in the centre of a sixfold pattern
The hexagonal pattern resembles a diffraction pattern,...
- 528
0
votes
0
answers
58
views
Effect of thickening polariser on intensity pattern
I've performed an experiment where microwaves were sent through a polariser of varying thickness, composed of $11$ slits (width and spacing both $6$ mm).
To vary the thickness of the polariser, this ...
- 149
0
votes
1
answer
42
views
What is the physical meaning of two solutions of grating solutions for $m=0$?
I was confused by how Feynman defined the angle of input and output. I thought it is regular reflection when input angle equals output angle where it is the first situation in Feynman’s description. ...
- 329
0
votes
0
answers
72
views
Why does yellow light shining on the tv diffract all spectrum of light?
This was an image I took during the evening time on the led tv , I had two questions the first was why was the tv giving off a x pattern of the diffracted light which constitutes primary white light ...
- 648
0
votes
0
answers
127
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Optics question: Simple way to transform a parallel bundle of collimated beamlets into a converging (diverging) bundle of collimated beamlets?
I'm searching for an optical element that converts a parallel bundle of individually collimated beamlets into a converging or diverging bundle of still collimated beamlets (or vice versa). So ...
- 181
1
vote
3
answers
250
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In an optical system, does the Point Spread Function apply to all light? Or only Point light sources?
So in optics, the Point Spread Function (PSF) describes how an optical system responds to a point source of light. My understanding is that this is due to diffraction and the wave-like nature of ...
- 203
0
votes
0
answers
39
views
Radius of bands in single slit diffraction
We've been given the following situation:
the cylindrical tube is of radius r and length l and is covered with an opaque disc having a small hole in the center on the left end and a point light source ...
2
votes
0
answers
47
views
Is it possible to measure the temperature of a candle by the diffraction method?
I am reading a book " Physics, Fun and Beyond" by Eduardo de Campos Valadares. In his book, he is mentioning about an experiment "bending laser beams with hot air." I am posting a ...
- 221
3
votes
3
answers
310
views
If $I$ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity if the slit width is doubled?
I've found a few results on the internet for this question, all with different explanations or different answers. Some say it'll become 4I and some that it'll not change. I see that there are a few ...
1
vote
1
answer
112
views
Diffraction of a laser composed of 2 monochromatic colours through a single slit / $N$ slits
To make the example simple, let's say we have a yellow laser that is the combination of 2 monochromatic lasers (green + red). In the example I will give, let's consider that the slits are narrow ...
- 197