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Polarization and spectral differential imager using channeled spectrum

机译:使用通道光谱的偏振和光谱差分成像仪

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摘要

The light from an exoplanet is expected to be different from that of its parent star in regard to polarization and spectral features. Thus, polarization or spectral differential technique will be a powerful tool for direct detection of exoplanets. We propose a novel technique that enables to detect both polarization and spectral differential images. This technique will be used in combination with the other high-contrast imagers to enhance the performance. This approach uses two Wollaston prisms (WPs) and a thick retarder (TR) inserted between the WPs. Two WPs generate four images and make it possible to obtain polarization differential images. Spectra of these four images have sinusoidal patterns (channeled spectra) due to the WP-TR-WP system. By inserting an interference filter, this system works as bandpass filters whose center wavelengths are different between the images. Therefore, both polarization and spectral differential images can be obtained. Furthermore, we propose to use two variable retarders (VRs) to remove differential aberrations caused by different optical paths of these four images. One VR is inserted in front of WP-TR-WP system to modulate the polarized light beams, and the other one is inserted between WPs to modulate the channeled spectra. By modulating the retardations of the VRs, it becomes possible to remove the differential aberrations. We present the principle of this method. Currently, we are conducting the preliminary laboratory experiment. The results of the laboratory demonstrations will be also reported.
机译:就偏振和光谱特征而言,预计系外行星发出的光与其母恒星的光会有所不同。因此,极化或光谱微分技术将成为直接探测系外行星的有力工具。我们提出了一种新颖的技术,能够检测偏振图像和光谱差分图像。该技术将与其他高对比度成像器结合使用以增强性能。此方法使用两个Wollaston棱镜(WP)和在WP之间插入的厚延迟片(TR)。两个WP生成四个图像,并有可能获得偏振差分图像。由于WP-TR-WP系统,这四个图像的光谱具有正弦模式(通道光谱)。通过插入干涉滤光片,该系统可以用作带通滤光片,其中心波长在图像之间是不同的。因此,可以获得偏振图像和光谱差分图像。此外,我们建议使用两个可变延迟器(VR)来消除由这四个图像的不同光路引起的差分像差。一个VR插入WP-TR-WP系统的前面以调制偏振光束,另一个VR插入WP之间以调制通道光谱。通过调制VR的延迟,可以消除差分像差。我们介绍这种方法的原理。目前,我们正在进行初步的实验室实验。还将展示实验室演示的结果。

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