Optics Question- Diffusion, Collimation, Homogenization

Hey all,

I'm new here, but this seems like a helpful community and I have a question I hope someone will be able to answer.

I am building a system, and in this system I have a path of UV light (356nm wavelength) which needs to be collimated and homogeneous.

The light path originates as a collimated beam from a LED light probe. This beam of light is expanded from a 8mm diameter to 25mm diameter using a beam expander (dual lens) system. However, the light is not yet homogeneous (it is currently exhibiting a relatively gaussian intensity distribution). To homogenize, I want to use a Holographic UV Diffuser (http://www.edmundoptics.com/optics/windows-diffusers/optical-diffusers/holographic-uv-diffusers/48513), but I can't seem to figure out how to determine what kind of divergence angle I'll have after the light passes through the diffuser. I'll most likely need to re-collimate the light after the diffuser (depending on the angle), but I don't know what collimation lens to choose without first knowing the divergence of the light exiting the diffuser.

Does anyone have any experience with this, or can point me to a resource that may be helpful?

Thanks!