• Chinese Optics Letters
  • Vol. 19, Issue 9, 091404 (2021)
Xun Li1、3, Ming Li1、**, and Hongjun Liu1、2、*
Author Affiliations
  • 1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an 710119, China
  • 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
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    Abstract

    We propose an effective way to achieve an enhanced optical absorption surface of titanium alloy 7 (Ti7) fabricated by a femtosecond (fs) laser assisted with airflow pressure. The effect of laser scanning speed and laser power on the surfaces’ morphology and average reflectivity was studied. In order to further reduce the surface’s reflectivity, different airflow pressure was introduced during the fabrication of Ti7 by a fs laser. Furthermore, the average reflectivity of samples fabricated under different laser parameters assisted with airflow was presented. In addition, the high and low temperature tests of all samples were performed to test the stability performance of the hybrid micro/nanostructures in extreme environments. It is demonstrated that the airflow pressure has an important influence on the micro/nanostructures for light trapping, the average reflectivity of which could be as low as 2.31% over a broad band of 250–2300 nm before high and low temperature tests, and the reflection for specific wavelengths can go below 1.5%.
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    Xun Li, Ming Li, Hongjun Liu. Enhanced optical absorption surface of titanium fabricated by a femtosecond laser assisted with airflow pressure[J]. Chinese Optics Letters, 2021, 19(9): 091404
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    Category: Lasers, Optical Amplifiers, and Laser Optics
    Received: Jan. 1, 2021
    Accepted: Mar. 4, 2021
    Published Online: Jun. 15, 2021
    The Author Email: Ming Li (liming@opt.ac.cn), Hongjun Liu (liuhongjun@opt.ac.cn)