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Hi,
Normally when we create CB for mirrors, we will set it up with tilt type (x-tilt, or y-tilt) and reflect angle.
Can anyone kindly let me know how does “ tilt about Z” work? Does it change the light propagation direction?
As shown below, when I add 135 deg tilt about Z to mirror 2, the polarization on the dummy surface after mirror 2 become 45 deg linear polarized light from vertically polarized light as input, why?
Thanks,
Ying
Best answer by Ethan
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Hi
Apologies on the delayed response to your question. In case this question is still relevant or for the benefit of others, I wanted to make some comments.
Generally, the Z-Axis is the direction of propagation or the “Optical Axis.” If the surface is standard and perpendicular to the Z-axis, then rotating about Z has little effect because often the optical surface is radially symmetric (and the beam is symmetric as well). In other words, if a lens rotates for instance 90 degrees, you won’t see any difference in the optical performance because the beam still sees the same surfaces.
However, if you rotate a system that does not have a radially symmetric beam, as in your case, you will see a change. I created a simpler example to demonstrate:
If we rotate the optical axis 45 degrees, the politization is still vertical but the politization seen by Surface 4 is now rotated by 45 degrees.
I hope this explanation better clarifies what happens when you rotate about the Z-axis.
Best,
Ethan
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Hi Ethan,
Thank you very much for your response. It is helpful!
Happy new year!
Ying
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