Application Research On Dispersion Performance Of Photopolymer Holographic Lens

With the rapid development of precision manufacturing,higher requirements are put forward for the measurement accuracy of precision inspection technology,especially the displacement and three-dimensional shape measurement of objects.In this thesis,the dispersion performance of the photopolymer holographic lens is researched and analyzed,and the photopolymer coaxial holographic lens is developed as a spectral confocal measurement system for high-dispersion optical elements to study the displacement and shape measurement of the object.The main contents of this paper are as follows:The photopolymer was prepared by the solution blending method,and the photopolymer holographic lens was developed by the holographic technology method.Then use the microscope to observe the microscopic grating image of the green-sensitive polymer holographic lens,and observe the diffraction imaging effect of the holographic lens.Analyzing the spatial dispersion characteristics of the green polymer holographic lens,it is found that the axial dispersion of the photopolymer coaxial holographic lens has a good linear relationship with the spatial position.Within the linear measurement range of 21.5mm,the corresponding wavelength shifts by 122.2 nm.,Its measurement accuracy can reach100 μm/0.57 nm.The PVA/AA multiplexed holographic lens was designed and developed using the method of optical path spatial multiplexing,and the spatial dispersion range of the acrylamide photopolymer holographic lens was further expanded.The study found that the axial spatial position of the PVA/AA multiplexed holographic lens has a good exponential relationship with the peak wavelength of the dispersion spectrum.Its axial dispersion range can reach 385 mm,and its measurement accuracy can reach 1.18 mm/0.5 nm.Based on the excellent spatial dispersion characteristics of the photopolymer holographic lens,a spectroscopic confocal measurement system of the photopolymer holographic lens was built.Using the developed spectroscopic confocal measurement device for testing,it is found that the experimental results are in good agreement with the displacement and morphology of the actual object.Among them,the green-sensitive polymer holographic lens spectral confocal measurement system can measure object displacement and topography with an accuracy of 47.5 μm/0.5 nm.It can be measured by a fiber optic spectrometer with a resolution of 0.01 nm,and its displacement and topography accuracy can reach 0.95 μm/0.01 nm.The PVA/AA multiplexed holographic lens spectral confocal measurement system has a displacement measurement range of 600 mm,and an overall displacement measurement accuracy of 2.24 mm/0.5 nm.Compared with the traditional dispersive lens,the thin photopolymer holographic lens prepared in this paper can effectively reduce the size of the device and provide high linear dispersion.This new type of polymer holographic lens will be used for high-precision surface topography measurement of large-scale macroscopic objects,significantly expanding the application range of existing spectral confocal devices.