Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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High Purification of Hg2Br2 Powder for Acousto-Optic Tunable Filters Utilizing a PVT Process

PVT공정을 이용한 음향광학 가변 필터용 Hg2Br2 파우더의 고순도 정제

  • 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)
  • 김태현 (충북대학교 신소재공학과) ;
  • 이희태 (그린광학 광학소재그룹) ;
  • 권인회 (그린광학 광학소재그룹) ;
  • 강영민 (그린광학 광학소재그룹) ;
  • 우시관 (그린광학 우주광학연구소) ;
  • 장건익 (충북대학교 신소재공학과) ;
  • 조병진 (충북대학교 신소재공학과)
  • Received : 2018.10.25
  • Accepted : 2018.11.27
  • Published : 2018.12.27
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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

References

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