Plano-convex lens, which side should face the laser source

[nordmoon]

I have two measurement cases in my setup. An divergating laser beam (not an gaussian) is measured at two locations from lens , at nearby i.e. 400 mm, and far away, > 2000 mm away. My lens is an plano-convex lens.

Which side should face the laser in these two cases?

I know that the plano-concave lenses, with the curved side to the laser source removes spherical aberrations,. is this also true for a divergaing beams?

My goal is to image the source onto a camera.

 

[Khashishi]

I can't understand your setup. Can you draw a picture?
See:
https://www.physicsforums.com/threa...-turn-a-thin-lens-around.939206/#post-5937843

Normally you want the plano side facing the camera, because the distance from the camera to the lens is usually smaller than the distance from the lens to the object. But I don't know what your camera distance is.