Collimating a white light beam

[MG_xy]

Dear all
I need collimating light from a Xe arc source.
More in details, the white light source is coupled to a monochromator. In fact I need a circular collimate light beam from the monochromator with a diameter of 1-2 mm.
At the moment I am using a (rectangular) slit in the monochromator of 1.2 mm.
Can you suggest me a possible solution?
Thank you

 

[Andy Resnick]

You are trying to collimate the monochromator output? That can be tricky. One possible solution is to launch the output into an optical fiber- a large multi-mode one should be fine- and collimate the fiber output. It's going to be very lossy, tho.

What is your application?