LIU Zhi-ying,ZHENG Qiu-shui,LI Wen-bo,et al.Optical system of tilted beam splitter type multicolor autocollimator[J].Optics and Precision Engineering,2021,29(04):682-690.
LIU Zhi-ying,ZHENG Qiu-shui,LI Wen-bo,et al.Optical system of tilted beam splitter type multicolor autocollimator[J].Optics and Precision Engineering,2021,29(04):682-690. DOI: 10.37188/OPE.2020.0540.
Optical system of tilted beam splitter type multicolor autocollimator
To design a tilted beam splitter type autocollimator, a method of correcting the on-axis astigmatism introduced by the plate beam splitter is proposed herein. The reason behind the astigmatism of the points on the axis is analyzed, and the method of correcting this astigmatism using a cylindrical lens is studied. A method of calculating the correction parameters for the cylindrical lens is developed. To tackle the residual chromatic aberration problem of the polychromatic autocollimator system, the correction method of combining the cylindrical beam splitter and cylindrical lens is proposed and compared with the method of combining the plate beam splitter and double cylindrical lens. The former is found to be better through a comparative analysis. The number of components can be reduced, and is more suitable for use in a tilted beam splitter type multicolor autocollimator. The design results indicate that the RMS value of the wave aberration of the system combining the cylindrical beam splitter and cylindrical lens is 1/26 waves, and the PV value is 1/5 waves. The system shows good astigmatism and achromatic effects. The image quality is effectively restored. Detecting the wavefront of the prototype, the RMS value is 1/25 waves, and the PV value is 5/26 waves, which is less than a quarter of the wave. The system imaging is good, verifying the correctness and feasibility of the design.
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