All Questions
Tagged with diffractionlaser
43 questions
2votes
0answers
55views
What is the explanation for different diffraction patterns 1cm behind grid vs. on distant screen?
I have a question regarding the following experiment. I wanted to see what a laser beam diffraction behind a grid looks like up close. I chose the following set up: That is, the grid is a combination ...
- 21
0votes
1answer
87views
How to calculate losses due to diffraction?
Assume a transmitter with a laser source generating gaussian beams and is transmitted using a telescope with radius of aperture $a_T$. The light is collected at the reciever end using a telescope of ...
- 220
2votes
2answers
301views
Beam spot size for a laser beam from space
I wanted to calculate the beam spot size for a laser beam from a satelite (100 - 36000 Km radius) orbiting the earth. I want to calculate the results to be as accurate as possible to the real world ...
- 220
0votes
1answer
152views
Huygens-Fresnel integral and Rayleigh integral
While working with the Huygens-Fresnel integral, I learned about the Rayleigh integral again, and I can't tell where they apply and whether they can be replaced equivalently. Also, in terms of ...
- 11
0votes
1answer
258views
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 ...
11votes
1answer
497views
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,...
- 538
0votes
0answers
54views
Kitchen experiment with a laser distance meter
I'm performing a kitchen experiment where a knife's blade is placed in the path of a laser distance meter(red light). At a distance of around 40cm I'm able to get distance readings that are smaller by ...
2votes
1answer
79views
Is this an accidental interference pattern?
I recently purchased this laser level. When I turned it on, I got excited when I noticed that it projected this interesting pattern on the wall: Is this an interference pattern? I don't know much ...
- 123
2votes
0answers
49views
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
1vote
1answer
153views
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
2votes
6answers
532views
What is the principle behind diffraction?
If we shine a green laser on a wall in a dark environment, we would observe a bright dot in the middle. Now, if we fix a grating just in front of where the laser is held, when the beam strikes the ...
1vote
0answers
61views
Vertical peaks in single slit diffraction pattern
I have the output from a single slit diffraction experiment using a HeNe laser (632.8nm), the diffraction grating is placed vertically so you expect to see only horizontal diffraction peaks in the “...
- 11
0votes
0answers
134views
"Loss" around the transmitting window of a laser cavity due to diffraction?
Take a laser cavity consisting of a gain medium, a totally reflecting mirror, and a partially transmitting window: (https://www.researchgate.net/figure/Laser-cavity-composed-of-a-gain-medium-in-...
- 939
0votes
1answer
565views
DIY Experiment fiasco: Single slit laser pointer already showing interference pattern
I tried to run the double slit experiment at home for my kid with a cheap red laser pointer. I partially covered the laser with four pieces of electrical tape to make a tiny square hole. To my ...
0votes
0answers
33views
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
