论文标题
天文光谱仪中光纤定位器操作的焦比降解
Focal ratio degradation for fiber positioner operation in astronomical spectrographs
论文作者
论文摘要
焦距降解（FRD），在光纤与输出之间的输入之间的光比增加，对于天文学光谱仪对吞吐量的影响和点扩散函数的影响，对于天文学光谱仪的表征很重要。但是，尽管FRD是许多纤维特性的函数，例如应力，微杆和表面缺陷，但传入光和纤维面之间的角度未对准也会影响光谱并使该测量变得复杂。将紧凑的实验设置和将FRD与角未对准分开的模型被应用于受到不同应力或角度未对准的纤维，以确定这些作用的幅度。然后确定将用于纤维定位器中的纤维，该纤维将用于Subaru Prime Focus谱仪（PFS）。我们针对PFS定位器进行的分析表明，角度未对准的影响占主导地位，不应发生由于压力引起的明显增加。
Focal ratio degradation (FRD), the increase of light's focal ratio between the input into an optical fiber and the output, is important to characterize for astronomical spectrographs due to its effects on throughput and the point spread function. However, while FRD is a function of many fiber properties such as stresses, microbending, and surface imperfections, angular misalignments between the incoming light and the face of the fiber also affect the light profile and complicate this measurement. A compact experimental setup and a model separating FRD from angular misalignment was applied to a fiber subjected to varying stresses or angular misalignments to determine the magnitude of these effects. The FRD was then determined for a fiber in a fiber positioner that will be used in the Subaru Prime Focus Spectrograph (PFS). The analysis we carried out for the PFS positioner suggests that effects of angular misalignment dominate and no significant FRD increase due to stress should occur.
