| Citation: | JIANG Hong-mei, HU Yuan, ZOU Hui-tian, HOU Zhen-min. Optimization design method for counter-rotating prisms atmospheric dispersion corrector[J]. Chinese Optics. doi: 10.37188/CO.2024-0204
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The counter-rotating prisms Atmospheric Dispersion Corrector (ADC) has been widely used for the calibration of large-aperture astronomical telescopes. To achieve an optimal design method for the counter-rotating prism ADC, effectively compensate for dispersion, and suppress optical axis drift introduced by the ADC, this study establishes a vector model for ray tracing of the counter-rotating prism ADC based on traditional atmospheric dispersion compensation theory. The vector models of dispersion compensation and optical axis drift are then derived. Using this mathematical model, the impacts of ADCs with different parameters on the dispersion compensation, prism rotation angle, and optical axis drift are simulated and analyzed. The simulation results show that when compensating for the same atmospheric dispersion with different material combinations and bonding types, the rotation angle of the prism group remains relatively consistent, with differences increasing as the zenith angle increases. Choosing materials with similar refractive indices near the central wavelength reduces chromatic aberration in the ADC output light and improves dispersion compensation. When compensating for large dispersions at different zenith angles, the optical axis offset angle of the system decreases as the number of bonded surfaces increases. Specifically, each additional bonded surface can reduce the optical axis drift angle by one order of magnitude. In practical ADC design, dispersion can be effectively compensated, and optical axis drift can be suppressed by controlling the number of bonded surfaces and material selection.
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