Hi Gianluca

I had a quick look at the datasheet.

For the angular distribution, it gives the half angles:

So check the help files. It shows how to convert half angles into αx. I would use the typical value to start of with.

The datasheet doesn’t really give any distribution so you could go for gaussian.

For the spatial distribution, I am not too sure about the size of the emitted area based on the datasheet. There is a mention of an emission point. Maybe you could use a point for the definition.

Otherwise a more simple model to start is the Source Two Angle.