The Generation Of Optical Vortex Array And Its Applications In Deformation Measurement

Optical vortex(OV)is a special optical structure with helical wave fronts and phase singularity where the intensity of optical field goes to zero.And phase varies in a corkscrew-like manner along the beam's direction of propagation.Optical vortex array(OVA)is composed of many single OV,and compared with the single OV,OVA has more advantages in application.For example,OVA can capture and observe multiple particles in the field of optical micromanipulation,compared with the single OV,this can improve efficiency greatly.In addition,OVA also has great advantages in applications such as microoptomechanical pump drives,multichannel optical communications,quantum information processing.In recent years,the use of OVA for precision measurement has aroused great interest in researchers.This paper introduces the method of using double gratings,single grating and phase gratings to generate OVA.And analyzing the characteristics of OVA.Then using the zero-contour of the imaginary and real parts of OVA to measure the deformation phase and results are good;Finally,analyzing and comparing the results.The main contents of this paper are as follows:1?A method of generating regular OVA by using double diffraction gratings is presented.And simulating this method.The simulation results show that the OVA of the different phase distribution is obtained by adjusting the diffraction distance of the two gratings.The formula of the intensity of the optical vortex array is derived.Analyzing the peak intensity of optical vortex array at different diffraction distance and the best diffraction distance of high quality optical vortex array is obtained.This method is simple and easy to implement,which provides a new method in generating optical vortex array.2?A method of generating optical vortex array by using single diffraction grating is presented.The method is that loading the single diffraction grating on spatial light modulator(SLM),let the plane light irradiate vertically and pass through the SLM,the optical vortex array is obtained by adjusting the diffraction distance of the grating.The formula of the optical vortex array distribution is also derived.Analyzing characteristics of optical vortex array at different diffraction distance.The simulation results show that the optical vortex array can be generated by using the diffraction grating.This method is more simple and easier to implement than the method of using double diffraction gratings.3?Using the zero-contour of the imaginary and real parts of OVA to measure the deformation phase and analyzing and comparing the results.Through simulation experiments,it can be obtained that whether using the zero-contour of the real parts or imaginary parts to measure,the errors that are measured by using the zero-contour that is generated by using single grating are smaller than the errors that are measured by using the zero-contour that is generated by using double gratings.And when using the zero-contour that is generated by using the same grating to measure,the errors that are measured by using the zero-contour of real parts are smaller than the errors that are measured by using the zero-contour of imaginary parts.The results show that measurement results by using the zero-contour of real parts that is generated by using the single grating are better.4?The zero-contour of the imaginary and real parts of OVA with topological charge 1 to 5 are generated by using phase gratings.Using the zero-contour to measure and analyzing the results.The simulation experiments show that it is feasible to measure the deformation phase by using the zero-contour of the imaginary and real parts of OVA.The number of topological charges is one of the factors that affect the measurement results.By analyzing and comparing the results,it can be obtained that the errors of results by using the zero-contour of real parts with the topological charge 5 and the zero-contour of imaginary parts with the topological charge 3 are smaller.And the results by using the zero-contour of real parts with the topological charge 5 are the best.This method provides a new way for the measurement of the deformation phase.