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Liquid crystal adaptive optics system for un-polarized light
DongmEi Cai; Jun Yao; Wenhan Jiang
Volume7209
2009
Language英语
Indexed ByEi
Subtype会议论文
AbstractA homogeneous aligned nematic liquid crystal (LC) cell can be used to phase modulate light. It has a series of attractive characteristics of compactness, high density integration, low cost and possibility of batch production in adaptive optics. However a problem has long existed for such devices is that they may be used only to control the phase of light polarized along the LC extraordinary axis since only the extraordinary light index can be varied by the application of the electric field. For a liquid crystal adaptive optics system using for astronomical imaging, low level un-polarized light is collected by the telescope. So the high optical efficiency is important and key factor for an adaptive optics system using for compensate atmosphere turbulence. If a polarizer placed before LC, 50% of incident un-polarized light is wasted. In this paper, a simple method is detailed described for phase modulating un-polarized light. Un-polarized light can be thought of as the superposition of any two orthogonal polarization states that are mutually incoherent. Iceland-spar OE crystal split incident un-polarized light into two polarized light, two same LCs modulated these two polarized light separately. After that, both these two polarized light beam are combined using another Iceland-spar OE crystal. These double LC adaptive optics system can phase modulate all incident un-polarized light, no light intensity is wasted.; A homogeneous aligned nematic liquid crystal (LC) cell can be used to phase modulate light. It has a series of attractive characteristics of compactness, high density integration, low cost and possibility of batch production in adaptive optics. However a problem has long existed for such devices is that they may be used only to control the phase of light polarized along the LC extraordinary axis since only the extraordinary light index can be varied by the application of the electric field. For a liquid crystal adaptive optics system using for astronomical imaging, low level un-polarized light is collected by the telescope. So the high optical efficiency is important and key factor for an adaptive optics system using for compensate atmosphere turbulence. If a polarizer placed before LC, 50% of incident un-polarized light is wasted. In this paper, a simple method is detailed described for phase modulating un-polarized light. Un-polarized light can be thought of as the superposition of any two orthogonal polarization states that are mutually incoherent. Iceland-spar OE crystal split incident un-polarized light into two polarized light, two same LCs modulated these two polarized light separately. After that, both these two polarized light beam are combined using another Iceland-spar OE crystal. These double LC adaptive optics system can phase modulate all incident un-polarized light, no light intensity is wasted.
Conference NameProceedings of SPIE
Conference Date2009
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7866
Collection微细加工光学技术国家重点实验室(开放室)
Corresponding AuthorDongmEi Cai
Affiliation中国科学院光电技术研究所
Recommended Citation
GB/T 7714
DongmEi Cai,Jun Yao,Wenhan Jiang. Liquid crystal adaptive optics system for un-polarized light[C],2009.
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