Optical dephasing in defect-rich crystals
Optical dephasing in defect-rich crystals
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DOI：
10.1063/1.480147
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发表时间：
1999-11-01
影响因子：
4.4
通讯作者：
Reineker, P
中科院分区：
文献类型：
--
作者：
Hizhnyakov, V;Reineker, P
研究了由光学中心与缺陷相互作用的振动调制引起的光学相移。这种机制对于具有大量缺陷的晶体至关重要，在低温下比拉曼机制更有效，这是由声子在光学中心的散射引起的。一种理论被开发出来，它允许人们根据温度 T 和缺陷浓度 c 找到这些系统中光谱孔的平均宽度和形状。发现孔的形状接近洛伦兹形状，在中间温度下，其宽度与 T-3 成正比，并且很大程度上取决于 c（对于带电点缺陷为 c(8/3)）。 (C) 1999 年美国物理研究所。 [S0021-9606(99)70640-9]。
The optical dephasing, caused by vibrational modulation of interactions of optical centers with defects is studied. This mechanism is essential for crystals with a substantial amount of defects, being more efficient at low temperatures than the Raman mechanism, caused by scattering of acoustic phonons at optical centers. A theory is developed, which allows one to find averaged widths and shapes of spectral holes in these systems dependending on the temperature T and concentration c of defects. The shape of the hole is found to be close to a Lorentzian, and at intermediate temperatures its width is proportional to T-3, and strongly depends on c (for charged point defects as c(8/3)). (C) 1999 American Institute of Physics. [S0021-9606(99)70640-9].