Hi all,

I am trying to simulate a Laser-Driven Light Source (or LDLS) in NSC. In particular, I have an EQ-99X, which I need to focus on a sample. The details of the source can be found here and here.

My setup is quite straightforward, as it only consists of two lenses. It is shown in the following image:

I would like to have a spot size of 10 µm, while the source has a dimension of 100 µm, therefore I started by designing a sequential system with magnification M=10, which I then optimized. I then chose and ordered the lenses, and the real setup works fine. I am now trying to understand if I can optimize the non-sequential system, to achieve better uniformity and spot size. However, the NS detector does not detect any photons, which is in contrast with the experimental results. Therefore I guess I am doing an error in the model, but I am not able to find it.

In particular, I am not sure that I chose the right Source object to model the LDLS: since the source has a circular profile, I used a Source Ellipsis with a 50 µm half-width in both directions and Cn=1.0. Am I missing something?



Thanks in advance for the answers,

Michele