Reflectivity measurement of highly reflective mirrors at spectral band of 2.7−3.0 μm

Zhou Wenchao; Wei Qianhe; Peng Chen; Huang Dequan; Zhu Rihong

doi:10.11884/HPLPB202436.240014

Volume 36 Issue 1

Jan. 2024

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Zhou Wenchao, Wei Qianhe, Peng Chen, et al. Reflectivity measurement of highly reflective mirrors at spectral band of 2.7−3.0 μm[J]. High Power Laser and Particle Beams, 2024, 36: 011002. doi: 10.11884/HPLPB202436.240014

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Zhou Wenchao, Wei Qianhe, Peng Chen, et al. Reflectivity measurement of highly reflective mirrors at spectral band of 2.7−3.0 μm[J]. High Power Laser and Particle Beams, 2024, 36: 011002. doi: 10.11884/HPLPB202436.240014

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Reflectivity measurement of highly reflective mirrors at spectral band of 2.7−3.0 μm

doi: 10.11884/HPLPB202436.240014

1.
School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2.
Institute of Applied Electronics, CAEP, Mianyang 621900, China
3.
School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China

Received Date: 2023-12-10
Accepted Date: 2024-01-15
Rev Recd Date: 2024-01-12

Available Online: 2024-01-17

Publish Date: 2024-01-15

Abstract

Abstract

The highly reflective (HR) mirrors with high-performance are widely employed in mid-infrared (mid-IR) laser systems. The manufacturing of mid-IR HR mirrors with high reflectivity requires techniques to precisely measure their high reflectivity. In this paper, a continuous-wave cavity ring-down (CRD) experimental apparatus in the 2.7−3.0 μm spectral range is established based on a quantum-cascade laser for high reflectivity measurement. By precisely optimizing the laser wavelength within the reflection band of the mid-IR HR mirrors, analyzing the influence of water vapor absorption on the ring-down time and reflectivity measurements, and comparing the reflectivity results measured under ambient air in clean-room laboratory and under nitrogen purging, the accurate measurement of high reflectivity is achieved at the 2.7−3.0 μm spectral band with an absolute reflectivity measurement accuracy of below 2×10⁻⁵ for about 99.95% reflectivity. The experimental results demonstrate that by setting the laser wavelength precisely to 2.9 μm and employing equal lengths of initial and test ring-down cavities (RDC) to avoid the influence of water vapor’s absorption lines, the reflectivity measurement for the 2.7−3.0 μm spectral band can be performed under normal clean-room laboratory air, without the need of nitrogen purging.
- mid-infrared,
- highly reflective mirror,
- reflectivity,
- cavity ring-down,
- absorption of water vapor

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References(21)

References

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