The investigation of the antireflection method and laser induced damage properties for perfluoroalkoxy copolymer film as short pulse laser debris shields

Abstract

Perfluoroalkoxy copolymer (PFA) film is a promising material for mitigating target debris in high-power laser system. However, the PFA film has a high reflectivity and the inert surface is difficult to achieve antireflection, which restrain the application for debris shield. In this paper, we experimentally demonstrate that broadband antireflection of PFA film can be achieved through combining oxygen plasma treatment and sol–gel coating techniques. In this case, transmittance over 99% with wide wave bands ranging from 600 to 1200 nm is achieved. For the plasma-treated PFA film, the withdrawal rate of 80 mm/min is an optimal withdrawal rate for broadband antireflection. The damage tests of bare and coated PFA films are investigated by a laser beam operating at 800 nm.