Scattering and mechanical loss of ultra-low loss laser coatings

被引：0
|
作者：
Zhang J. [1 ]
Wang F. [1 ]
Fang S. [1 ]
Jiao H. [1 ]
Cheng X. [1 ]
Wang Z. [1 ]
机构：
[1] Institute of Precision Optical Engineering, MOE Key Laboratory of Advanced Micro-Structured Materials, Shanghai Frontiers Science Center of Digital Optics, Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2022年 / 30卷 / 21期
关键词：
interface scattering; laser coating; mechanical loss; nodule defect;
D O I：
10.37188/OPE.20223021.2655
中图分类号：
学科分类号：
摘要：
Ultralow-loss laser coatings have important applications in precision measurement fields such as gravitational wave detection，optical atomic clocks，and optical cavity ring-down spectroscopy. The cavity length stability and total optical loss of the laser resonator determine the sensitivity and signal-to-noise ratio of the measurement system. With the development of thin-film materials，fabrication processes and detec⁃ tion techniques，significant progress has been achieved in thin-film optical loss and thermal noise research. As regards optical loss，the absorption of the thin film can be controlled at the sub-ppm level，and the scat⁃ tering of the thin film has become the main contributing factor of optical loss. This paper focuses on defect-induced scattering and interface scattering and presents the research ideas and achievements of thin-film scattering control. The interface scattering of thin films is reduced through optical factor design and inter⁃ face power spectral density control. The theoretical analysis model of nodule defect-induced scattering is es⁃ tablished，and the physical mechanism and the control technology of the defect-induced scattering are pro⁃ posed. With regard to thermal noise research，this paper primarily introduces the physical mechanism of thin-film mechanical loss，presents the mechanical loss reduction of reflective coating through thin-film ma⁃ terial optimization，and the corresponding improvement in the characterization method of mechanical loss. © 2022 Chinese Academy of Sciences. All rights reserved.
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页码：2655 / 2677
页数：22
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