This potential does not degrade significantly as the focal length increases.
The injected beam radius is 3 cm for the 3-m focal length and 6 cm for the 6-m focal length.
Three images are taken at the same positions as above, and for the same focal length and beam diameter.
The laser beam is focused by a 25-cm focal length silver mirror through a 0.5-mm-thick fused-silica window into the laser-gas interaction chamber.
It is obvious that the shorter the focal length is and the stronger the intensity at the focus will be.
This is to be expected as it is known to be associated with the focal length of the laser.
Such an individual receives a large numerical penalty equal to 500,000 plus 500,000 times the distance by which the back focal length is offset.
It may be necessary to set a larger focal length because of obstructions in the robot's path.
