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http://dx.doi.org/10.3740/MRSK.2018.28.12.732

High Purification of Hg2Br2 Powder for Acousto-Optic Tunable Filters Utilizing a PVT Process  

Kim, Tae Hyeon (Department of Advanced Material Engineering, Chungbuk National University)
Lee, Hee Tae (Optical Material Group, Green Optics)
Kwon, In Hoi (Optical Material Group, Green Optics)
Kang, Young-Min (Optical Material Group, Green Optics)
Woo, Shi-Gwan (Space Optics R&D, Green Optics)
Jang, Gun-Eik (Department of Advanced Material Engineering, Chungbuk National University)
Cho, Byungjin (Department of Advanced Material Engineering, Chungbuk National University)
Publication Information
Korean Journal of Materials Research / v.28, no.12, 2018 , pp. 732-737 More about this Journal
Abstract
We develop a purification process of $Hg_2Br_2$ raw powders using a physical vapor transport(PVT) process, which is essential for the fabrication of a high performance acousto-optic tunable filter(AOTF) module. Specifically, we characterize and compare three $Hg_2Br_2$ powders: $Hg_2Br_2$ raw powder, $Hg_2Br_2$ powder purified under pumping conditions, and $Hg_2Br_2$ powder purified under vacuum sealing. Before and after purification, we characterize the powder samples through X-ray diffraction and X-ray photoelectron spectroscopy. The corresponding results indicate that physical properties of the $Hg_2Br_2$ compound are not damaged even after the purification process. The impurities and concentration in the purified $Hg_2Br_2$ powder are evaluated by inductively coupled plasma-mass spectroscopy. Notably, compared to the sample purified under pumping conditions, the purification process under vacuum sealing results in a higher purity $Hg_2Br_2$ (99.999 %). In addition, when the second vacuum sealing purification process is performed, the remaining impurities are almost removed, giving rise to $Hg_2Br_2$ with ultra-high purity. This high purification process might be possible due to independent control of impurities and $Hg_2Br_2$ materials under the optimized vacuum sealing. Preparation of such a highly purified $Hg_2Br_2$ materials will pave a promising way toward a high-quality $Hg_2Br_2$ single crystal and then high performance AOTF modules.
Keywords
acousto-optic tunable filters; $Hg_2Br_2$ powders; PVT; high purification; vacuum sealing;
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