Mg_(0.5)Sr_(0.5)Fcl_(0.5)Br(0.5) 혼합결정 내에 도핑된 Sm^(3+)의 환원법에 따른 광학적 특성 및 영구적 홀 생성
Reduction Effects on the Persistent Spectral Hole-Burning and Optical Properties of Sm^(3+) Ions-Doped in Mg_(0.5)Sr_(0.5)Fcl_(0.5)Br(0.5) Mixed Crystals
혼합결정 도핑 환원법 광학 영구적 홀 영구적 스펙트럼;
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Sm^(2+)-doped Mg_(0.5)Sr_(0.5)FCl_(0.5)Br_(0.5) mixed crystals have been prepared under three different reduction conditions: the first one is by firing at 1,100℃ for 1 hour in a reducing stream of hydrogen gas, the second one is by firing at 1,100℃ for 1 hour in air and then heating at 800℃ in a reducing stream of hydrogen gas, and the third one is the same as the second one, but with x-ray irradiation. Optical properties of Sm^(2+) ions were first studied through emission spectroscopy and persistent spectral holeburning(PSHB) using the sample prepared in a reducing stream of hydrogen gas. The emission spectrum due to ^(5)D_(1)→^(7)F_(0) transition was shifted toward the low energy direction with decreasing temperature. The PSHB was made effectively either by using one colour or two colour holeburning process at 300, while it was made effectively by the latter process only at 1.5 K. The reduction effect on PSHB was also studied. The results showed that while PSHB was easily produced in the sample prepared by the first method using photon gated spectral holeburing method, PSHB did not occured in the sample prepared by the third method under the same experimental conditions at 1.5 K. That the characteristics for PSHB and optical properties of Sm^(2+)are highly dependent on the reduction process of Sm^(3+) into Sm^(2+) is discussed. Further theoretical and experimental work is needed to understand the detailed physics of the phenomenon.