All Questions
15
questions
13
votes
2
answers
183
views
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
0
votes
0
answers
29
views
Generation of an beam with an arbitrary initial profile
Is it possible to generate a beam with an arbitrary initial profile? For example, the finite Airy beam has an initial profile $$\phi(s,0)=exp(\alpha s)Ai(s).$$
In practice, this finite Airy beam is ...
- 21
1
vote
0
answers
48
views
Roughly how large is the reflected pattern on the Earth by a retroreflector array on the Moon illuminated by a laser on Earth?
I've been thinking about What is the minimal equipment required to observe the Apollo lunar retroreflectors? for a while and every time I start to estimate the strength of the received signal I choke ...
- 6,273
1
vote
1
answer
339
views
Effect of stacking diffraction gratings
I have a basic question about the effect of transmitting a laser beam through multiple diffraction gratings. Suppose a diffraction grating was used to produce many spots as follows:
Would adding a ...
- 203
1
vote
0
answers
93
views
Effect of metal disks on diffraction of light [closed]
Recently, I started to go deeper into physics. I don't speak English well, so I'm sorry. This experiment was carried out in Hungary 25 years ago. The measurement results were not accepted by the ...
- 11
1
vote
1
answer
471
views
Influence of monochromator entrance slit width on spectral bandwidth
I am working with a Czerny–Turner monchromator (a Bentham TMc300, to be precise), with adjustable entrance and exit slits. I started by acquiring the signal with the slits completely opened, and I got ...
- 27
1
vote
1
answer
210
views
Can Fresnel zone plates be used as collimators
I quite often use the principle in physics that (outside of thermodynamics), all laws of physics are time-reversible. And so, when looking at collimating microwave light, I though that it might be ...
- 972
0
votes
1
answer
64
views
Uncertains of diffraction mesaurement with a photodiode
I have to study the diffraction curve of a laser passed through a slit.
To measure the intensity i am using a photodiode and a voltmeter;
I move the photodiode and measure the intensity every $200\mu$...
1
vote
0
answers
398
views
Diffraction grating and light source intensity
In an absorption spectroscopy, light sources are often XENON or deuterium + halogen lamp, which tend to have wide spectrum (example: 180-700). Consider cases, where no slit or optical filter is ...
- 11
2
votes
0
answers
263
views
Printing zone plate with laser printer
I tried to print my own zone plates on transparent plastic with laser printer with this generator. I prepared a lot of plates with different settings - focus from 4 to 60 cm, 3 wave lengths, etc.
Yet ...
- 629
2
votes
3
answers
1k
views
Single slit diffraction - choosing a wavelength?
For the classic experiment of determining the slit width of a single slit. If we assume the rough order of magnitude of the width is known. What factors determine the choice of wavelength?
(Clearly ...
5
votes
4
answers
795
views
Possibility of making an experiment in a classroom to simulate DNA diffraction
I am a TA in a structural chemistry class. The professor want me to show students how Watson and Crick determined the structure of DNA from X-ray diffraction results of DNA crystals. The professor ...
0
votes
1
answer
501
views
Diffraction and Shape in the grating
Suppose, I use a laser with a known wavelength of 650 nm through a "opaque grating" that has a pattern of holes of same shape and size. We can see the pattern on the screen. We know the distance ...
- 101
2
votes
1
answer
773
views
Diffraction Gratings
Is it possible to use the sawtooth shape diffraction grating instead of rectangular grating
if yes then which parameters will affect at the output ? Secondly, what is special in blaze grating ...
- 611
3
votes
2
answers
2k
views
Perfect pinhole diffraction pattern with sharp fringes using a 632nm laser
I'm trying to produce a diffraction pattern with pinhole using a laser of 632nm wavelength .The pinholes' diameter are ranging from 10um , 25um , 50 um , 0.1mm and so on .
I also have good lenses for ...
