As we found that the beam was too big on the IMC refl camera (alog 16166), I inserted a focusing lens (PLCX-25.4-20.6-UV) in front of it in order to obtain a better and wider view. The belows are pictures before and after the lens insertion.

Before

After

Both pictures were taken with the nominal exposure time of 19444 usec. In the second image, the main 00 mode is seen at the lower right. I am not sure whether if the upper part of the image is explainable by spatial higher order modes. It maybe a ghost beam. Note that this ghost-ish structure was visible with a laser card.