Design And Practical Application Of Excitation Light Scanning Device For Up-conversion Display Technology

3D display technology is one of the key technologies of virtual reality.3D display can express the sense of depth and layering of images,and is widely used in film and television entertainment,military,and video Communication and other fields?3D technology development,supplement 1-2 sentences,?Multi-photon frequency up-conversion luminescence is an anti-Stokes luminescence process.Display technology based on the principle of up-conversion luminescence can realize a true three-dimensional display of real-time observation of multiple people and multiple angles without using external equipment such as glasses and helmets.In the up-conversion luminescent material medium,pixels can be excited by laser irradiation,and by controlling the spatial coordinates of the pixels,the visible light spot can be presented at any position in the medium.Based on this principle,a three-dimensional scanning device for the excitation light source is designed and manufactured to achieve true three-dimensional display in a transparent medium.At present,in the field of material preparation,upconversion light-emitting bulk dielectric materials with excellent optical properties have been prepared by means of improving crystal growth technology,preparing organic-inorganic composite materials doped with nanoparticles.However,issues such as how to achieve point-like focusing of the laser in motion in such transparent bulk materials and how to achieve dynamic display of pixels are still technical difficulties in the field of up-conversion true three-dimensional display.Aiming at the above problems,this paper designs and builds a three-dimensional excitation and scanning system for exciting light,and prepares an organic-inorganic composite medium with red upconversion luminescence,which can realize true three-dimensional display in this medium.The main research contents are as follows:?1?Based on the principle of up-conversion luminous true three-dimensional display,an excitation light three-dimensional focused scanning device is designed and prepared.The device includes: a laser light source,a collimating beam expander,a focusing device,a two-dimensional galvanometer,a control board,an optical feedback component,a computer,and corresponding software.The first is to design a three-dimensional image to be displayed on the computer,and use the software on the computer to analyze and calculate the scanned image to generate multiple scanning instructions and data;then the instruction signals and data will be transmitted to the control board and transmitted.After completion,some data and instructions are stored,and some instructions and data are re-analyzed and processed by the FPGA chip on the board,and then transmitted to the execution command end?the execution command end includes the two-dimensional galvanometer,focusing device and laser light source?.The specific laser motion path can be described as the laser light source is turned on to emit laser light.The laser light is expanded by a collimating and expanding device to form an approximately parallel laser beam?the purpose is to reduce the energy loss caused by the laser divergence?.The laser maintains a point-like focus during the movement and controls the movement of the laser focus in the Z axis),and finally passes through a two-dimensional galvanometer?guarantees that the laser focus is in two dimensions,that is,X and Y axis movements,by receiving instructions and data?Pixels are dynamically displayed in the dielectric material.?2?A red up-conversion luminescent organic-inorganic composite material was prepared,and the composite material was used as a display medium to realize static three-dimensional display.First,monodisperse KMn F3: Yb^{3 +},Er^{3 +} nanocrystals were prepared by solvothermal method.X-ray diffraction,transmission electron microscopy,and Fourier transform infrared absorption spectroscopy were used to characterize the size and morphology of nanocrystals.The synthesized samples are nanocrystals with uniform cubic phase size.?What is the size and shape of the nanocrystals,which is added here?The spectral properties of the upconversion luminescence properties of the nanocrystals were studied.Under the excitation light of 980 nm,the nanocrystals showed red upconversion luminescence.Second,the prepared nanocrystals were copolymerized with methyl methacrylate to prepare a colorless and transparent organic-inorganic composite bulk material.The material exhibited red upconversion luminescence under the excitation light of 980 nm.Then,using the designed excitation light source three-dimensional scanning device,a true three-dimensional static display pattern is realized in the up-converted luminescent medium material.For such nanocrystals that emit red light under 980 nm laser irradiation,the surfactant we used in the experiment is oleic acid.In this way,unsaturated double bonds can be further modified on the surface of the nanoparticles by adding the active agent.And by observing the infrared absorption spectrum of the nanocrystals,we can find that the surface of the nanocrystals was successfully modified with unsaturated functional groups,which laid the foundation for our next copolymerization reaction.The next step is the copolymerization reaction between the materials,because the surface of the nanocrystals has been successfully modified with unsaturated functional groups in the above experiments.In this way,we can copolymerize the nanocrystals with the polymer monomer MMA,and the KMnF₃ nanocrystals will be linked by covalent bonding By connecting with PMMA long chain?making the nanoparticles stable and uniformly dispersed in the polymer matrix?,a nanocomposite with high transparency was prepared.Finally,the computer sends instructions to control the scanning path of the focal point?pixel?of the 980 nm semiconductor laser as the excitation source,thereby drawing a three-dimensional image in the block nanocomposite.In the research work of this paper,we use the multi-photon frequency up-conversion light emission mechanism as the principle of display technology,and use the self-designed excitation light source three-dimensional scanning device to realize Two-dimensional and three-dimensional display.