利用法布里-珀罗标准具提高天文高分辨光谱仪的波长定标精度.docx
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摘要
用于天文高分辨光谱波长定标的法布里-珀罗标准具(FPE)具有宽波长覆盖与密集透过峰序
列的光谱,有望实现比传统定标源更高的波长定标精度。然而 FPE 透过峰波长是未知的,这
为定标带来了挑战。本研究在不借助额外精密测量设备(如傅里叶变换光谱仪)情况下,使用
天文高分辨光谱仪常规定标源钍氩灯(ThAr)为 FPE 提供波长信息,再利用 FPE 密集的透过
峰序列以及电介质反射膜穿透深度与波长关系的平滑性质,修正波长信息中的误差,得到
FPE 透过峰精确的波长并完成波长定标。在兴隆 2.16 m 望远镜高分辨光纤光谱仪上的定
标测试显示,FPE 的波长定标精度达到 0.053 pm,相比单独使用 ThAr 的波长定标精度
(0.290 pm)有显著的提高。
Abstract
Due to the wide wavelength coverage and dense transmission peak sequence of its
spectrum, the Fabry-Perot etalon (FPE) for wavelength calibration of astronomical high-
resolution spectra is expected to achieve higher calibration accuracy than traditional
calibration sources. However, the unknown wavelengths of FPE transmission peaks pose
a challenge for calibration. In this study, without precision measurement devices (such as
Fourier transform spectrometers), the thorium-argon (ThAr) lamp, a conventional
calibration source equipped on astronomical high-resolution spectrometers, was used to
provide the FPE with wavelengths. Then, the errors in the ThAr wavelengths were
corrected by using the dense transmission peak sequence of the FPE and the smooth
relationship between the penetration depth of the dielectric reflective coating and the
wavelength. Accurate wavelengths of the FPE transmission peaks were thus obtained,
and wavelength calibration was performed. The calibration test on the fiber-fed high-
resolution spectrometer of the Xinglong 2.16-m telescope showed that the wavelength
calibration accuracy of the FPE reached 0.053 pm, which was significantly higher than
that (0.290 pm) in the case of the ThAr being used alone.
1 引言
法布里-珀罗标准具(FPE)是一种多用途的光学器件,在光学滤波
[1-2]
、激光稳频
[3-4]
、精密测量
[5-6]
等领域发挥着重要作用。FPE 通常是一块两面镀有高反射膜的透明平板或是由两块平行
的、内表面镀有高反射膜的平板组成。根据多光束干涉原理,当入射光的频率满足共振条件
时,其透射强度会达到峰值。FPE 的白光透过光谱呈现为频率间隔均匀的洛伦兹线型透过峰
序列。
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