Learning Forum

[mcamp1]

Hello,

I'm trying to rotate a cylindrical lens by 90 degrees so that a different axis of the beam is focused. This is the system before any coordinate breaks:

I want to have the beam collimated before the paraxial lens and then converge/diverge afterwards. This requires a rotation of the cylindrical lens. However, rotating the lens doesn't affect the beam, and instead affects the subsequent surfaces. This:

Results in this:

Where you can see that the final surface has changed while the beam shape has not. Am I doing something wrong with the tilt? The coordiante break is setup to have 90 degree tilt in z and -90 tilt afterwards.

 

[Niki Papachristou]

Hi Subscriber,

I am a little bit confused here, with the Tilt/Decenter elements tool I would expect the element to be tilted and not the subsequent surfaces. It would be good to go through this Knowledge base article to make sure you are using the tool properly in order to achieve your design goals: How to tilt and decenter a sequential optical component. Additionaly, I have difficulties on noticing the differences between the LDE of your first case with the LDE on your second case.

Another reason that I can think of why you dont see a collimated beam is the fact the your EPD is smaller than the lens diameter. 

Hope that was helpful, let me know if I can be of further assistance.

Regards,

Niki

[mcamp1]

 

Hello,

Thanks for the response! The difference between the two LDEs is that in the first one, the Coordinate Breaks have 0 for Tilt about Z. The second LDE has 90 and -90 for Tilt about Z. All I hope to achieve is a 90 degree rotation of one element, so I believe this should be enough.

I’m attaching a picture of what I hope to achieve by rotating:

As you can see the beam can be collimated, it's just currently in the wrong axis. This screenshot was achieved by rotating the entire coordinate system in the 3D Viewer, but I would expect to see the same results by only rotating the cyindrical lens in the LDE.