Ok, there is not so much on this picture. But, what you see is the laser head itself under it's hood and the transparent pipe that shields the laser beam from atmospheric disturbances. (The device on top of the transparent hood is a laser head of an old interferometer and is not related to the system in any way - execpt that it was used before the new interferometers were installed. (The picture was taken during the installation phase, so excuse the litter on the floor - it is cleared now.)