Open AccessEffect of the interface on femtosecond laser damage of a metal-dielectric low dispersion mirror
Author(s) -
Yuhui Zhang,
Yanzhi Wang,
Ruiyi Chen,
Zhi-Hao Wang,
Jianlong Zhao,
Dawei Li,
Meiping Zhu,
Yuanan Zhao,
Yufeng Jin,
Kui Yao,
Yuxin Leng,
Ruxin Li,
Hongbo He,
Jianda Shao
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416141
Subject(s) - materials science , femtosecond , laser , dielectric , optics , dispersion (optics) , stress (linguistics) , residual stress , optoelectronics , composite material , linguistics , philosophy , physics
Metal-dielectric low dispersion mirrors (MLDM) have a promising application prospect in petawatt (PW) laser systems. We studied the damage characteristics of MLDM and found that the damage source of MLDM (Ag + Al 2 O 3 +SiO 2 ) is located at the metal-dielectric interface. We present the effect of the interface on the femtosecond laser damage of MLDM. Finite element analysis shows that thermal stress is distributed at the interface, causing stress damage which is consistent with the damage morphology. After enhancing the interface adhesion and reducing the residual stress, the damage source transfers from the interface to a surface SiO 2 layer, and the damage threshold can be increased from 0.60 J/cm 2 to 0.73 J/cm 2 . This work contributes to the search for new techniques to improve the damage threshold of MLDM used in PW laser systems.