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Newton's Rings ("Bull's-eye" Interference Patterns) when using a camera with a laser

Symptom:

In some applications involving lasers (especially laser beam profiling), you may see an interference pattern on the image, resembling a "bull's eye".

Cause:

This effect is commonly known as "Newton's Rings", and is due to the laser light interacting with the image sensor's "coverglass".

The effect varies depending on many variables, including the curvature of the coverglass, wavelength of light, incident angle, etc.

More details can be found here: https://en.wikipedia.org/wiki/Newton's_rings

Solution:

The only 100% effective solution is to remove the image sensor's coverglass.

However, this is a very labor-intensive process with a very high risk of damage to the sensor's die (even a small particle of dust on an open die will damage many pixels).

For most applications Basler maintains a list of reputable 3rd parties who can provide aftermarket coverglass removal.

The customer is encouraged to contact Basler sales / support to discuss their application and find the appropriate solution.