Hi All, could someone please clarify how to observe a phase shift, that is induced by a moving diffraction grating?
In the layout (see the image), the grating is moved parallel the light source. The defined diffraction orders of the grating are +1 and -1. By recombining the diffracted light, I would expect intensity change due to interference as a function of a gratings position. However, this is not the case, and the intensity remains constant (see the graph).
Note: My original answer (which is now an attachment) has been updated as follows.
It appears that the NSC diffraction grating should properly handle ray phase change with grating translation. Here is an example:
The model file is attached.
Regards,
Jeff
Hi
Thank you so much for taking time to look into my problem.
In my example the graphs should have been showing translation along the Y, but I was getting the same results for both X and Y translations.
I adapted your example to use a source ellipse for a collimated beam. It still worked for a single pixel detector, but when I changed to multiple pixels, it produced results I was getting before. Apparently according to Zemax Help, there is a Normalize Coherent Power checkbox in the object properties that must be ticked off. Otherwise, the total power on the detector is normalized in such a way that it appears constant.
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