Hello everyone,

In order to be more precise in my question, I want to show you the design I did.

The magnification that I wanted to reach was -0.5, focal f1= -291mm, focal f2=138mm, focal f3=80mm. distance between the first and second lens=100mm, distance between the second and third lens=295mm.

First, I modelled the system with paraxial lenses only (capture1). I also set a gaussian beam illumination. As you can see, the system works pretty well, and gives a magnification of -0.509.

However, when I try the same thing but adding 2 optotunes (liquid lenses), the magnification of ~ -0.5 cannot be reached (capture2)! I don’t know if I did something wrong in the setting of the gaussian beam, or if it is the use of adaptative surfaces that can set the whole system out of paraxial condition for the operand PMAG to work correctly…

What would you change in order to reach a good magnification?

Hi Marie,

I’d use GBPS to get the Gaussian beam size on the two surfaces, and then use DIVI to divide one by the other to get magnification.

• Mark

Hi Mark,

I just tried this, but it looks like the operation gives the same result as the magnification calculation with PMAG…

(see capture)

Do you think adaptative surfaces have a strange behaviors when using paraxial operands with it?

Best regards,

Marie.

Hello again,

I finally found my mistake: I didn’t set the correct radius of curvature in order to get the good focal. That is why the system was not working.

Thank you for your help!

Glad you got it fixed!