Research On Wavefront Reproduction Technology Based On Spatial Light Modulator

Holographic technology includes holographic recording and holographic display technology,while modern holographic recording technology is mostly based on computational holography calculated by theory,and there are many different methods in holographic display.Therefore,compared with the traditional holographic technology,this paper studies a purely optical method.The traditional holographic technique uses two beams of coherent light to intervene to record and reproduce the wavefront information of an object,including light waves.The intensity and phase information then present the stereo image of the object.However,this traditional holography requires high precision for coherent light,and the application range is limited,and the light wave information of the object cannot be completely reproduced.This paper proposes a new three-dimensional display of modern holographic technology.We first use the wavefront sensor to acquire and record the wavefront information of the real object light field into data information,including the intensity and phase information of the object light.Then,a two-dimensional grayscale image including the original light wavefront information is created in the computer program,and the intensity grayscale image and the phase grayscale image are input into the intensity-type spatial light modulator and the phase-type spatial light modulator,respectively.The parallel light is modulated by the optical field to realize the wavefront reproduction and imaging of the original object.This experimental study selected an object that simulates a three-dimensional effect.The object consists of two two-dimensional planar objects separated by a distance.It can be assumed that it is a whole,with the effect of the front and back surfaces of the three-dimensional object,that is,the tomographic effect.The experimental method first collects the optical wavefront information of the chromatograph,and then reconstructs the image of the wavefront.The tomographic imaging needs to simulate the transfer function of the imaging lens on the spatial light modulator to calculate the phase distribution of the imaging surface.It was subjected to chromatographic observation.Clear and blurred images of the object can be observed when adjusting the imaging position of the analog lens.The experimental results of the method illustrate its feasibility,and provide an effective research method for the subsequent threedimensional display and new holographic technology.