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  • Received: Jun. 15, 2020

    Accepted: Jun. 30, 2020

    Posted: Nov. 1, 2020

    Published Online: Oct. 23, 2020

    The Author Email: Wang Yanzhi (yanzhiwang@siom.ac.cn), He Hongbo (yanzhiwang@siom.ac.cn)

    DOI: 10.3788/CJL202047.1103001

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    Yuhui Zhang, Yanzhi Wang, Ruiyi Chen, Zhihao Wang, Jiaoling Zhao, Dawei Li, Yuanan Zhao, Meiping Zhu, Kui Yi, Yunxia Jin, Hongbo He, Yuxin Leng, Jianda Shao. Performance of Broadband Low Dispersion Mirrors with High Damage Threshold[J]. Chinese Journal of Lasers, 2020, 47(11): 1103001

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Chinese Journal of Lasers, Vol. 47, Issue 11, 1103001 (2020)

Performance of Broadband Low Dispersion Mirrors with High Damage Threshold

Zhang Yuhui1,2,3, Wang Yanzhi1,3,4,*, Chen Ruiyi1,2,3, Wang Zhihao1,2,3, Zhao Jiaoling1,3,4, Li Dawei1,3,4, Zhao Yuanan1,3,4, Zhu Meiping1,3,4, Yi Kui1,3,4, Jin Yunxia1,3,4, He Hongbo1,3,4,*, Leng Yuxin4,5, and Shao Jianda1,3,4

Author Affiliations

  • 1Thin Film Optics Laboratory, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Key Laboratory of High Power Laser Materials, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 4CAS Center for Excellence in Ultra-Intense Laser Science, Chinese Academy of Sciences, Shanghai 201800, China
  • 5State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

Abstract

Low dispersion mirrors with broad bandwidth and high damage threshold are indispensable optical components in a petawatt (PW) laser system. Here, we systematically investigate the optical properties, dispersion characteristics, damage resistance characteristics and damage mechanisms of metal-dielectric mirrors, dielectric mirrors and ternary composite mirrors. The dielectric films can improve the damage thresholds of metal films. The transmission efficiency and damage threshold of silver-dielectric mirrors are higher than those of Au and Al. The typical damage morphology of near threshold metal-dielectric mirrors under the action of femtosecond lasers is bulge, and the reason is that the metal layer absorbs a lot of energy and causes the thermal stress damage. In ternary composite mirrors, the existence of the protective HfO2 layers makes the electric field in Ta2O5 decrease, the initial damage layer is transferred to HfO2, and the threshold increases without sacrificing reflection bandwidth and dispersion performance.

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