Three-dimensional display may be one of the most wonderful techniques attracting scientists to research on. But most of current approaches are fictitious ones. On the CLEO'94 , E. A. Downing and L. Hesselink et al. reported a virtual three-dimensional volumetric display using Pr doped fluoride glass upconversion luminescence which is evaluated as a new excellent physics achievement in 1996.The ZBLAN:Pr glass is proved by L. Hesselink to be a interesting material for three-dimensional volumetric display based on upconversion. In the processes of upconverting near-infrared radiation to visible, the 1G4 level of Pr locates at an important position. But the transition probability of 3H4-1G4 proved to be one or two order of magnitude smaller than other strong transitions. So to improve the population on 1G4 has an practical significance.In this paper, we report a simple 3-D volumetric display experiment which has used the upconversion sensitization *This project is supported by the National Natural Science Foundation of China 122 SPIE Vol. 3560 • 0277-786X198/$1O.00 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
We propose a novel ghost imaging scheme which is especially served to a pure phase object A spatially incoherent beam is mixed with a coherent beam of the same frequency field by a beamsplitter. Then we perform the ghost imaging scheme using the mixed beam. Our theoretical result shows that this approach is capable of reconstructing a pure phase object in joint-intensity measurement. The visibility of the images is also analysed for two pure phase objects, an optical wedge and a phase grating.
The optical limiting effect of solubilized carbon nanotubes on 1064 and 532nm laser is studied in experiment. The experiments are carried out with samples of different thickness and concentration, and the optical limiting experiments are also carried out with pure solvent (chloroform) in order to confirm that the opt ical limiting effect is due to carbon nanotubes. The results showed that the sol ubilized carbon nanotubes have good optical limiting characters to both 1064 and 532nm laser.
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