{"id":194849,"date":"2021-03-05T15:44:48","date_gmt":"2021-03-05T12:44:48","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/researchers-propose-novel-dichroic-laser-mirror-design-with-mixture-layers-and-sandwich-like-structure-interfaces\/"},"modified":"2021-03-05T15:44:48","modified_gmt":"2021-03-05T12:44:48","slug":"researchers-propose-novel-dichroic-laser-mirror-design-with-mixture-layers-and-sandwich-like-structure-interfaces","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/researchers-propose-novel-dichroic-laser-mirror-design-with-mixture-layers-and-sandwich-like-structure-interfaces\/","title":{"rendered":"#Researchers propose novel dichroic laser mirror design with mixture layers and sandwich-like-structure interfaces"},"content":{"rendered":"

“#Researchers propose novel dichroic laser mirror design with mixture layers and sandwich-like-structure interfaces<\/strong>”<\/p>\n

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\n Fig. 1. Schematic diagram of the proposed MDLM design. Credit: SIOM
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Recently, a research team from the Shanghai Institute of Optics and Fine Mechanics of the Chinese Academy of Science<\/a>s (CAS) proposed a new design with mixture layers and novel sandwich-like-structure interfaces to meet the challenging requirements of the ideal dichroic laser mirrors. The research article was published in Photonics Research<\/i> on Jan. 27, 2021, and was highlighted as an Editor’s Pick.<\/p>\n


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Dichroic laser mirrors are usually used as harmonic separators, beam combiners or splitters. They play an important role in many laser app<\/a>lications, including inertial confinement fusion laser, petawatt femtosecond laser, high power fiber lasers, compact Q-switched or mode-locked lasers, and other emerging lasers. The requirements for dichroic laser mirrors continue to increase with the development of laser technology<\/a>. The ideal dichroic laser mirror for high power lasers requires a significantly different reflection or transmission property and a high laser-induced damage threshold (LIDT) at two different wavelengths of interest simultaneously. <\/p>\n

Unfortunately, traditional dichroic laser mirrors (TDLM) composed of alternating high- and low-refractive-index (n) pure materials often have difficulty in achieving excellent spectral performance and high LIDTs at two wavelengths simultaneously. There is a trade-off between the required optical performance and LIDT. <\/p>\n

In this work, the researchers designed and prepared a mixture-based dichroic laser mirror (MDLM), which uses HfO2<\/sub>-Al2<\/sub>O3<\/sub> mixture material as a high-n layer with adjustable n and optical bandgap, and pure SiO2 as a low-n material. The interface between the low-n SiO2<\/sub> layer and the high-n HfO2<\/sub>-Al2<\/sub>O3<\/sub> mixture layer is a sandwich-like-structure interface (“SiO2<\/sub>-HfO2<\/sub> gradient material | HfO2<\/sub> | HfO2<\/sub>-Al2<\/sub>O3<\/sub> gradient material”), which replace the traditional discrete interface. <\/p>\n

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\n Fig. 2. Microstructure and optical property of the TDLM and MDLM coatings. Credit: SIOM
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The MDLM shows excellent spectral performance and improved performance over TDLM with finer mechanical property, lower absorption, and higher LIDT. For both the s-polarized 7.7-ns pulses at a wavelength of 532 nm and the p-polarized 12-ns pulses at a wavelength of 1,064 nm, the LIDTs are almost doubled. <\/p>\n

This MDLM design strategy opens new avenues for improved dichroic mirror coatings and other laser coatings and can benefit many areas of laser technology that rely on high-quality laser coatings.<\/p>\n\n

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Nanolaminate-based design for UV laser mirror coating\n <\/p><\/div>\n

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\n More information:<\/strong>
\n Tingting Zeng et al. Dichroic laser mirrors with mixture layers and sandwich-like-structure interfaces, Photonics Research<\/i> (2020). DOI: 10.1364\/PRJ.411372<\/a><\/p><\/div>\n
\n Provided by
\n Chinese Academy of Sciences
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Citation<\/strong>:
\n Researchers propose novel dichroic laser mirror design with mixture layers and sandwich-like-structure interfaces (2021, March 5)
\n retrieved 5 March 2021
\n from https:\/\/phys.org\/news<\/a>\/2021-03-dichroic-laser-mirror-mixture-layers.html<\/p>\n

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\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n