Wavelength calibration of a high resolution spectrograph with a partially stabilized 15-GHz astrocomb from 550 to 890 nm.
Wavelength calibration of a high resolution spectrograph with a partially stabilized 15-GHz astrocomb from 550 to 890 nm.
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DOI：
10.1364/oe.25.006450
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发表时间：
2017-03
期刊：
影响因子：
3.8
通讯作者：
R. McCracken;É. Depagne;R. Kuhn;N. Erasmus;L. Crause;D. Reid
中科院分区：
文献类型：
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作者：
R. McCracken;É. Depagne;R. Kuhn;N. Erasmus;L. Crause;D. Reid
在10米的南非大型望远镜上安装了一个跨度为555-890纳米的可见天文梳，对其高分辨率光谱仪的一个通道进行了完整的校准，并准确地确定了其分辨率。一种新的共耦合方法允许同时观测天空，Th-Ar灯和天文梳通道，与仅使用Th-Ar线获得的波长校准不确定性相比，将波长校准不确定性降低了两倍。主频率梳状激光器优异的无源稳定性使宽带星梳的产生不需要载波包络偏频锁定，原子参考窄线宽二极管激光器为波长校准提供了绝对基准标记。简单的星梳结构使非专业人员能够在实际的望远镜环境中进行日常操作。星上光谱学结果完全由星梳直接标定完成。
A visible astrocomb spanning 555-890 nm has been implemented on the 10-m Southern African Large Telescope, delivering complete calibration of one channel of its high-resolution spectrograph and an accurate determination of its resolving power. A novel co-coupling method allowed simultaneous observation of on-sky, Th-Ar lamp and astrocomb channels, reducing the wavelength calibration uncertainty by a factor of two compared to that obtained using only Th-Ar lines. The excellent passive stability of the master frequency comb laser enabled broadband astrocomb generation without the need for carrier-envelope offset frequency locking, and an atomically referenced narrow linewidth diode laser provided an absolute fiducial marker for wavelength calibration. The simple astrocomb architecture enabled routine operation by non-specialists in an actual telescope environment. On-sky spectroscopy results are presented with direct calibration achieved entirely using the astrocomb.