Abstract Intensity dependence of the total effective trap density Neff is studied theoretically for the two-centre and the three-charge-state photorefractive crystals. The results show that Neff always increases with increasing intensity in three-charge-state crystals, whereas it has more complicated behaviors in two-centre crystals. When SD$\gamma$T/ST$\gamma$D is small, Neff increases and tends to saturate with increasing intensity for both type-A and type-B two-centre crystals. When SD$\gamma$T/ST$\gamma$D is large, Neff increases to a maximum and then decreases a little for type-A crystals and decreases greatly for type-B crystals. The different intensity dependences of Neff in the two types of crystals come from their different level structures.
Received: 05 March 1999
Accepted manuscript online:
PACS:
42.70.Nq
(Other nonlinear optical materials; photorefractive and semiconductor materials)
Fund: Project supported by a Grant for Key Research Projects in the "Climbing" Program from the State Science and Technology Commission of China, and also by the National Natural Science Foundation of China (Grant No. 9734040).
Cite this article:
Chi Ming-jun (迟明军), Dou Shuo-xing (窦硕星), Ye Pei-xian (叶佩弦) THEORETICAL STUDY OF THE INTENSITY DEPENDENCE OF TOTAL EFFECTIVE TRAP DENSITY IN PHOTOREFRACTIVE CRYSTALS 1999 Acta Physica Sinica (Overseas Edition) 8 664
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
