Eliminating the damage of pencil beam by the misaligned optical lens system

The potential damage of optical elements induced by the pencil beam in high power laser system is analyzed based on augmented matrix optics.The numerical results of positioning the ghost points in spatial filter of high power laser system are presented.It is shown that tilting one of lenses in the spatial filter can reduce(or eliminate) the potential damage of pencil beam.The result shows that using the misaligned optical lens system and tilting the lens can avoid the damage caused by pencil beams in high power laser system.