Matlab images of the NI ring

Same job made on the NI ring. First is the image of the ring alone, second with CH on and some minor re-alignement of the AXICON. Power on the screen is approx 6W.

I found an image of the NI bench with annulus and CH on where, by chance, I put a "standard candle", so it is possible to infer the pixel vs distance relationship. The "candle" is in the red "box" on the upper left side of the image.



Next image shows the data and the Gaussian fit of the profiles in the X and Y directions. The Gaussian fit is very good and the "waist" of the CH beam seems to be of the order of 13mm.