Non-Collimated Beam Effects on Gratings

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Illuminating a grating with a non-collimated beam causes the fringe pattern to blur due to the presence of multiple wave-vectors instead of a single incident wave-vector. This results in a convolution of the grating's response to a single wave-vector with the angular spectrum of the incident beam. The blurring effect can significantly impact the clarity and quality of the observed diffraction pattern. Understanding these effects is crucial for applications involving gratings in optical systems. Proper beam collimation is essential to achieve sharp and distinct fringe patterns.
Neo20
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Hi,

I was wondering what happens when a grating is lightened by non collimated beam.

Could anyone tell me?

Thanks!
 
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Your fringe pattern gets blurred because you are illuminating the grating with multiple wave-vectors, rather than just a single incident wave-vector.

The resultant pattern is a convolution between the response of the grating to a single wavevector and the k-spectrum (or angular spectrum) of your incident beam.

Claude.
 
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