| We are living in a three-dimensional world.Holographic display technology is a way to display the most complete information of objects so far,because this method preserves the phase and amplitude information of the objects light wave,so that people can obtain the same visual effect as observing the original objects when observing the holographic reappearance.The early holography focuses on the study of the display of traditional optical holography.Traditional optical holography usually use traditional holographic recording material as a recording carrier,but it is usually difficult to erase the hologram that has been recorded.Therefore,early holography can not realize the dynamic and real-time performance of holographic display.The development of spatial light modulator and digital holography meets the requirements of holographic real-time display.Digital holography that who use charge-coupled device instead of traditional holographic plates has the advantages of digital,controllable,real-time and convenient.It is the main direction of the future development of holographic display.As we all know,the core contents of digital holography are optical digital recording,computer digital reconstruction,and quantitative measurement of objects.In this thesis,the digital hologram is introduced into the spatial light modulator for real time reproduction,thus the optical image of the digital holography can be formed in the space,and it can also be measured at the same time,rather than the digital reproduction of the digital image,which can only be displayed on the computer screen.Based on theoretical analysis,this thesis designs a digital holographic recording and holographic optical display system.The digital hologram of the three-dimensional object is collected by CCD(Charge-Coupled Device),and it is loaded into the spatial light modulator(SLM,Spatial Light Modulator)in real time,then the spatial light modulator is lighted by laser illumination to reappear the image of an object.The main contents of this thesis include the following aspects:Firstly,the application of digital holography in 3D display is retrospect,and the performance and characteristics of the photoelectric image recording device(CCD)and the spatial light modulator(SLM)are analyzed.Secondly,the key problem involved in the input of the digital hologram into the spatial light modulator is the problem of parameter matching and the optimal information acquisition,that is,the problem is that the matching of the recording parameters of the digital hologram and the parameters of the spatial light modulator.Only matching can we obtain measurable quantitative optical reproduction.Because the limited number of pixels in the hologram recording device affects the amount of information recorded.How to make full use of the number of pixels of the recording device to get the maximum amount of information is an unavoidable problem in the optical reproduction of the digital hologram.In this thesis,the relationship between spatial light modulator spatial resolution,CCD resolution,object size,and the magnification of the reconstructed image is analyzed theoretically in detail in the holographic recording and reproducing process.Thirdly,according to the theoretical analysis,this thesis chooses the appropriate photoelectric devices,including the CCD devices that record digital holograms,spatial light modulator for displaying holograms,and designing the path of digital hologram recording and the optical reproduction.In this thesis,we use the discriminant board to carry out rigorous experimental verification.The experimental results prove the correctness of the theoretical and experimental design. |
