Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Abstract

Low dispersion mirrors are important because of their potential use in petawatt (PW) laser systems. The following two methods are known to increase the laser-induced damage threshold of low dispersion optical components: use of a wide-bandgap-material protective layer and control of electric field distribution. By controlling the electric field distribution of composite low-dispersion mirrors (CLDM), we shift the electric field peaks from the material interface into the wide-bandgap material. However, the damage threshold of modified-electric-field composite low dispersion mirror (E-CLDM) does not increase. Damage morphology shows that the initial damaged layer is Ta2O5. An immediate cause is the enhancement of the electric field in internal layers caused by surface electric field regulation. Theoretical calculations show that the damage threshold of CLDM or E-CLDM is determined by the competition results of bandgap and the electric field of layer materials. The CLDM with different materials or different protective layer periods can be optimally designed according to the electric field competition effect in the future.

Single-shot structured light projection profilometry with SwinConvUNet

“…SLP projects a sinusoidal striped fringe onto the surface to be measured, then the fringe is deformed by the surface and captured by a camera. Finally, the depth map can be calculated using the triangulation principle 4 , 5 . The phase-shifting profilometry (PSP) has the highest accuracy of the existing SLP methods.…”

“…Finally, the depth map can be calculated using the triangulation principle. 4,5 The phase-shifting profilometry (PSP) has the highest accuracy of the existing SLP methods. PSP is better suited for static measurement since it requires multiple phase-shifting fringes to demodulate the phase information.…”