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首页> 外文期刊>Journal of Optics >Preliminary design techniques to mitigate the polarization effects due to telescope optics of the Thirty Meter Telescope (TMT)
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Preliminary design techniques to mitigate the polarization effects due to telescope optics of the Thirty Meter Telescope (TMT)

机译：初步设计技术可减轻三十米望远镜（TMT）的望远镜光学所产生的偏振效应

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摘要

In polarimetric observations of astronomical sources, instrumental polarization and crosstalk from the telescope optics affect the measurements. They arise due to the reflections from the mirror surfaces of the telescope. An analytical model was developed to estimate these values for the Thirty Meter Telescope. The model determines an instrumental polarization of 1.2% and crosstalk of 40% at a wavelength of 0.6 μm. The analyses indicated that the Nasmyth (tertiary) mirror of the telescope, (used to fold and steer the light to the various instrument ports) is the primary source of the high values of instrumental polarization and crosstalk. We present here, a possible optical layout to cancel out the effects introduced by the Nasmyth mirror. Different configurations are studied to reduce/cancel the effect of the IP and crosstalk before the light from the Nasmyth mirror, reaches the instrument. While the optical components introduced after the tertiary mirror reduce the telescope instrumental polarization and cross talk, it leads to a reduction in the intensity due to additional reflections.
机译：在天文学源的极化观测中，望远镜光学仪器的极化和串扰会影响测量结果。它们是由于望远镜镜面的反射而产生的。开发了一个分析模型来估算三十米望远镜的这些值。该模型确定在波长为0.6μm时的仪器偏振为1.2％，串扰为40％。分析表明，望远镜的纳斯密斯（三级）镜（用于将光折叠并引导至各个仪器端口）是仪器偏振和串扰值较高的主要来源。我们在这里介绍一种可能的光学布局，以抵消纳斯密斯镜带来的效果。研究了不同的配置，以减少/取消来自Nasmyth镜的光到达仪器之前IP和串扰的影响。虽然在三级镜之后引入的光学组件减少了望远镜的仪器偏振和串扰，但由于额外的反射，导致了强度的降低。

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