Allen [12] examined the surface roughness evolution of ion-beam sharpening fused silica, and the outcomes confirmed which the surface area roughness value increased with a rise in the removal depth. At the same time, experiments have also proven that ion-beam sputtering can effectively lessen area roughness [13,14]. Bradley and Harper https://www.facebook.com/permalink.php?story_fbid=pfbid0ww438oyjEcTfX4xX6WCkQF5vy17yCx8goi3oH5YDkinKfFGxbWMtjjaD7YsNT2eKl&id=61562415773754&__cft__[0]=AZX-QAR_vhBkIQn-CHh-qVrVh-ymnljhRn7R-P73MC_nPlGeMjnnVcKfwAEvBSElWyReFDgdGfaBcSpcbzAjhXGt0VgSnonh2-Sn7EAslXaDomawwoS-fOBcpNsz1qhfPyulei1EyrV9fPp46vN--t13J6MfE305voku70pu4oXlBKLuIpeJRsbHFczk72IvZfA7Z3DWbF39VtWGhkRqIUI-&__tn__=%2CO%2CP-R