Possible to make speckles without a Laser?

  • Thread starter darthw
  • Start date
  • #1
darthw
4
0
Hello,
it is possibile to make speckles on a surface with a LED or something else? With a Michelson Interferometer you can get interferences with an LED -> are this already speckles?

regards,
Hans
 

Answers and Replies

  • #2
phinds
Science Advisor
Insights Author
Gold Member
2021 Award
18,031
10,575
what do you mean by "speckles" ? Do you mean just colors on the surface or do you mean pits in the surface ?
 
  • #3
darthw
4
0
Hello,
I mean the second one, this pits in the surface
 
  • #4
Ibix
Science Advisor
Insights Author
9,734
10,023
You get speckle when coherent light hits a diffuse reflecting surface. Can you think of a way to get coherent light from an LED?
 
  • #5
darthw
4
0
right now, no...I don´t know how to realize this :frown:
 
  • #6
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,725
2,629
Hello,
it is possibile to make speckles on a surface with a LED or something else? With a Michelson Interferometer you can get interferences with an LED -> are this already speckles?

regards,
Hans

Sure- since speckle is a measure of spatial coherence, you can create speckles with any source. You can image speckle generated by sunlight: the speckles are about 0.06 mm in diameter and you need to spectrally filter the light to get good contrast.

https://www.osapublishing.org/ol/abstract.cfm?uri=ol-37-17-3516
 
  • #7
darthw
4
0
Hello,

that sounds great. I´m trying to build up this experiment.
thx
 

Suggested for: Possible to make speckles without a Laser?

Replies
1
Views
320
  • Last Post
Replies
9
Views
703
Replies
4
Views
517
Replies
1
Views
369
Replies
7
Views
815
  • Last Post
Replies
15
Views
2K
Top