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?
Best answer by EthanView original
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.
Thank you very much for your response. It is helpful!
Happy new year!