Learning Forum

[Numbers are mysterious.]

I want to model the output of fibre which is gaussian having a total divergence of 0.1 radian and beam waist is 6mm .Then using a lens I need to collimate them.Which source should I use or if I am using Source Gaussian DLL,how to add divergence? In my current setup the beams are already collimated but I want beam to be diverging and then collimated by a lens. How can I design this ?

[dominique.galvez-ext]

Hi Numbers,

When using the Source Gaussian in nonsequential mode, you'll see the two parameters, beam radius and position described in the Help files here. Through these two parameters, you can define your divergence angle and beam size, since the 'position' parameter defines the effective distance from your actual Source Position as described in the Z Position column of your NonSequential Component Editor to the apparent position of virtual point source. I'm attaching a drawing below to describe this relationship. Knowing the relationship between your desired divergence angle and desired beam size, you can then solve for your Parameter 7 'position' value. 

Let me know if there are any further issues!



Best,
Dominique