All Questions
9
questions
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1
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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
answers
58
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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
3
votes
3
answers
310
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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
120
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How does intensity depend on slit-width regarding Fraunhofer diffraction?
For a single slit, considered to be infinitely long, with size $b$ the intensity at any angle is given by:
\begin{equation}
I(\theta)=I(0) \bigg( \frac{\sin \beta}{\beta} \bigg)^2
\end{equation}
...
- 134
0
votes
0
answers
193
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Complex intensity in electric field (transfer matrix)
Currently I'm coding a transfer matrix approach in C#. Hence, I come up with certain electric fields $E$. At each position I have a propagating field to the right $E_{\text{right}}$ and one to the ...
- 143
1
vote
1
answer
567
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Why do I obtain the wrong total power when integrating this Fraunhofer diffraction irradiance pattern for a circular aperture?
I am looking for some help understanding something. I am working through my optics textbook (Hecht, 4th Edition), and am following the example of the far-field Fraunhofer diffraction pattern caused by ...
- 165
0
votes
3
answers
1k
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What is happening on the screen as you reduce the slit width? How can you demonstrate that mathematically? [closed]
I think in the case of a single slit, as you reduce the slit width the central peak decreases. The width decreases the amount of light entering the slit actually decreases,so when the area under the ...
- 3
0
votes
1
answer
5k
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What happens to the diffraction pattern when the width of a single slit is increased?
https://phet.colorado.edu/en/simulation/wave-interference
According to the simulation in the above link if the width of the slit is sufficiently increased then the intensity of the central point ...
- 272
3
votes
2
answers
869
views
What determines how much power goes into each diffraction order?
Imagine a grating with infinite number of slits, and the spacing D between slits is larger than the wavelength so that there are high order diffractions. In each of the diffraction directions the ...
- 131