arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1207.4487astro-ph.IM
收藏

用于VIRUS摄谱仪阵列的体相位全息光栅的性能评价方法

Methods for evaluating the performance of volume phase holographic gratings for the VIRUS spectrograph array

Taylor S. Chonis, Gary J. Hill, J. Christopher Clemens, Bart Dunlap, Hanshin Lee

摘要:

可见光积分场可复制单元摄谱仪(VIRUS)是一个由至少150个简单的光纤馈电积分场摄谱仪副本组成的阵列,将部署在Hobby-Eberly望远镜(HET)上进行HET暗能量实验(HETDEX)。每个摄谱仪包含作为其色散元件的体积相位全息光栅,其用于350 nm至550 nm的第一级。我们讨论了用于评估原型光栅的性能的测试方法,这些方法有助于修改制造处方,以实现HETDEX所需的指定批次衍射效率。特别是,我们讨论的测试中,我们测量的衍射效率在标称光栅入射角在病毒的所有订单访问我们的测试台,允许的光栅方程。对于选定的光栅,这些测试使我们能够解释> 90%的入射光的波长在VIRUS的光谱覆盖范围内。其余未被考虑的光可能被衍射成反射级或在光栅层内被吸收或散射(特别是对于较蓝的波长,后一项可能占主导地位)。最后,我们讨论了一种装置,将用于快速验证一阶衍射效率规格的一批至少150病毒生产光栅。

英文摘要:

The Visible Integral Field Replicable Unit Spectrograph (VIRUS) is an array of at least 150 copies of a simple, fiber-fed integral field spectrograph that will be deployed on the Hobby-Eberly Telescope (HET) to carry out the HET Dark Energy Experiment (HETDEX). Each spectrograph contains a volume phase holographic grating as its dispersing element that is used in first order for 350 nm to 550 nm. We discuss the test methods used to evaluate the performance of the prototype gratings, which have aided in modifying the fabrication prescription for achieving the specified batch diffraction efficiency required for HETDEX. In particular, we discuss tests in which we measure the diffraction efficiency at the nominal grating angle of incidence in VIRUS for all orders accessible to our test bench that are allowed by the grating equation. For select gratings, these tests have allowed us to account for > 90% of the incident light for wavelengths within the spectral coverage of VIRUS. The remaining light that is unaccounted for is likely being diffracted into reflective orders or being absorbed or scattered within the grating layer (for bluer wavelengths especially, the latter term may dominate the others). Finally, we discuss an apparatus that will be used to quickly verify the first order diffraction efficiency specification for the batch of at least 150 VIRUS production gratings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑