Is Bragg Diffraction Depicted Accurately in Common Diagrams?

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SUMMARY

The discussion centers on the accuracy of common diagrams depicting Bragg diffraction in acousto-optics. Participants clarify that while the Bragg condition requires the satisfaction of specific criteria for diffraction, it does not necessitate equal angles of incidence and reflection. The confusion arises from various diagrams, some of which inaccurately portray these angles as equal. Ultimately, the consensus is that the diagrams may be misleading, and the Bragg equation does not imply equal angles for different orders of diffraction.

PREREQUISITES
  • Understanding of Bragg's Law in crystallography
  • Familiarity with acousto-optics principles
  • Knowledge of X-ray crystallography techniques
  • Ability to interpret scientific diagrams and equations
NEXT STEPS
  • Study the derivation and applications of Bragg's Law in detail
  • Explore the principles of acousto-optics and its applications in modern technology
  • Examine various diagrams of Bragg diffraction for accuracy and clarity
  • Learn about the implications of different diffraction orders in X-ray crystallography
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Students and researchers in physics, particularly those focusing on acousto-optics, crystallography, and optical engineering, will benefit from this discussion.

2sin54
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Hi. So I am studying a bit on acousto-optics and as far as I've gathered, when the Bragg condition is met, the incident ray of light should just be reflected (in a perfect case) with the angle of reflection equal to the angle of incidence.
However, this picture does not agree with my thoughts: http://www.mt-berlin.com/pict_0/fig1ao.gif

Is it correct? I mean the Bragg diffraction. The picture clearly suggests that the incidence and reflection angles need not be equal..
 
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Gytax said:
Hi. So I am studying a bit on acousto-optics and as far as I've gathered, when the Bragg condition is met, the incident ray of light should just be reflected (in a perfect case) with the angle of reflection equal to the angle of incidence.
However, this picture does not agree with my thoughts: http://www.mt-berlin.com/pict_0/fig1ao.gif

Is it correct? I mean the Bragg diffraction. The picture clearly suggests that the incidence and reflection angles need not be equal..
If they were always equal, I think that X Ray crystallography would not work. All that's necessary is for the Bragg criterion to be satisfied.
 
Can you not get different orders for the incoming and outgoing beam? Perhaps not. The Bragg equation doesn't suggest that you can.
The most likely answer is that the diagram you are looking at is just drawn wrong.
 

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