Research On Beam Splitting Characteristics Of Wollaston Prism And Its Application In Interference Imaging

Birefringent interference imaging spectroscopy is an effective method of optical detection.It has the advantages of simple structure,compact size,high throughput and high spectral resolution.It has important applications in the fields of material classification,target recognition,environmental detection and biomedicine.In this paper,we starting from the Wollaston prism of the core beam splitting device of birefringent interferometric imaging system,the optical properties of three kinds of Wollaston-type polarizing beam splitting prisms are analyzed in detail,and a new design scheme of Wollaston-type multi-beam splitting prism is proposed,which provides theoretical basis and possibility for applying this type of prism to multi beam detection technology.Based on this,a novel polarization-difference interference imaging system with adjustable spectral resolution is proposed,and two implementations are designed: a polarization-difference interference imaging system based on Wollaston prism angular shear and dual Wollaston prism lateral shear combining;a polarization-difference interference imaging system with the combination of field-of-view Savart polariscope lateral shear and dual Wollaston prism lateral shearing,theoretical analysis and experimental verification show that the system has the excellent characteristics of simultaneous acquisition of orthogonal polarization information and adjustable spectral resolution of the system,which enhanced the technology's information acquisition capabilities and multi-task target detection capabilities.The main content of the article includes:The first chapter introduces the basic concept of interference imaging spectroscopy,classification and the development of birefringence interference imaging spectroscopy.And the main contents of the paper is briefly summarized.In the second chapter,the optical characteristics of the conventional Wollaston prism are briefly analyzed.The influence of the azimuth angle on the performance of the prism is analyzed,and the relationship between the splitting angle of the prism with the incident angle and the azimuth angle is given.The third chapter is the theoretical analysis of the performance parameters of the two new Wollaston polarization beam splitting prisms.The influence factors affecting the splitting symmetry and the influence of the structure angle on the splitting are analyzed.A new Wollaston-type multi-beam splitting prism has been designed.The principle of the splitting of the prism is analyzed.The influence of the structure angle of the prism on the beam splitting ratio and the beam splitting angle is studied,and the structural scheme for realizing the parallel splitting are given.In the fourth chapter,the basic theory of polarization imaging spectroscopy and polarization-difference imaging are briefly described.Two new designs of polarization-difference interference imaging system with adjustable spectral resolution are proposed: a polarization-difference interference imaging system based on Wollaston prism angular shear and dual Wollaston prism lateral shear combining;a polarization-difference interference imaging system with the combination of field-of-view Savart polariscope lateral shear and dual Wollaston prism lateral shearing,the principle of polarization-difference interference and spectral resolution regulation are analyzed respectively,and the numerical simulation and experimental test are carried out to prove the feasibility of the scheme.The research in this paper shows that the Wollaston Prism can be strictly and symmetrically splitting by modifying the exit surface of the conventional Wollaston prism,but the splitting symmetry of the prism is greatly affected by the incident angle;the new Wollaston-type multi-beam splitting prism can realize four beams,the polarized splitting beam intensity can be approximately equal by controlling the angle of the prism structure.The polarization-difference interference imaging system based on Wollaston prism has the ability to simultaneously acquire orthogonal polarization direction information and the spectral resolution is adjustable.It can meet the requirements of multi-target and multi-task spectral image detection and improve the recognition of target.It has a certain guiding significance for improving the detection performance of interferometric imaging spectroscopy.