Research On Optical Field Modulation Via Deformable Mirrors

With the increasing demand for different laser beam light field structures,research on light field control is becoming very meaningful.At this stage,a single light field structure can no longer meet the increasing demands of different light fields in many fields.What’s more light field control is widely used in such as optical communications,light confinement,laser beam transformation,light field structure changes,laser weapons as well as other different fields.This paper is based on the study of light field control of69-unit continuous free-form surface deformable mirror.Aiming at the free-form surface optical characteristics of the deformable mirror,the superposition effect of the light field control of the actuators of the deformable mirror is analyzed.In order to facilitate the directional control of the required light field,by combining the Zernike polynomials,the mirror surface of the deformable mirror is abstracted into a Zernike polynomial mathematical combination model,which is further realized by simple linear superposition of the Zernike polynomial combination for control the deformable mirror.This paper carries out theoretical analysis and theoretical simulation research on the Bessel beam light field structure and Airy beam light field structure respectively,and further generates Bessel beam light field structure and Airy beam light field structure based on 69-unit continuous free-form surface deformable mirror.Experiments are carried out to verify the feasibility of free space adjustment of light field based on deformable mirror.The specific research content of this article is as follows:(1)Zernike’s theory is used to simulate the shape of the deformable mirror when the light field is adjusted under different parameters and the light intensity distribution of the longitudinal section of the light field structure after the adjustment.Aiming at the freeform surface optical characteristics of the deformable mirror,the surface shape of the 69-element continuous free-form deforming mirror is abstracted into a combination of simple linear superposition of Zernike polynomials,and a mathematical model of mirror deformation based on different Zernike coefficients is established.Different coefficient pairs are discussed and analyzed that the light field control generates the influence of the light field structure of the Bessel beam and the light field structure of the Airy beam.(2)Firstly,an experiment of generating Bessel beam light field structure based on69-unit continuous free-form surface deformable mirror is constructed.Begin with the generation theory of Bessel beam light field structure and carry out theoretical simulations to analyze the deformed mirror shape under the control of the light field and the light intensity distribution of the Bessel beam light field.Furthermore,experiments are carried out to explore the influence of the deformable mirror on the light field distribution of the Bessel beam generated by the different cones generated under different driving strokes.From the data analysis,it can be seen that there is an optimal driver stroke interval,in which the deformable mirror is controlled to generate a tapered surface to achieve a better light field distribution of the Bessel beam.(3)Secondly,an experiment based on 69-unit continuous free-form deformable mirror to generate Airy beam light field structure is constructed.The mirror surface is abstracted into a simple linear superposition of Zernike polynomials,and a mathematical model of the mirror surface based on different Zernike coefficients is established.Furthermore,the different mirror surface shapes generated under different parameters are given,and the influence of the light field structure generated by the Airy beam is analyzed.The experimental data shows that there is an optimal interval for the combination coefficients of different Zernike polynomials,and changing the combination coefficients will affect the light field structure of the Airy light field.At the same time,it is further verified through experiments that the Airy beam light field structure based on the deformable mirror has self-reconstruction characteristics.(4)Last but not least,explore the space-domain free light field control experiment based on 69-unit continuous free-form surface deformable mirror.Start with the aberration theory,optimize the Airy beam light field structure generation method,and obtain a better airy beam light field structure distribution based on the deformable mirror.Further,control the rotation of the light field generated by the Airy beam by controlling the deformable mirror.This paper explores the continuous free light field control in the space domain based on the deformable mirror,and realizes the control of different beam light field structures.The possibility experiment of continuous laser light field structure control based on the deformable mirror is given,which provides a new research direction for light field control.