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Zhao Fei, Wang Huijuan, Zhao Gang, Wang Liang, Liu Yujuan. Wavelength Calibration of the Xinglong HRS with a Laser Frequency Comb Device of a Yb Fiber Laser[J]. Astronomical Research and Technology, 2015, 12(1): 117-126.
Citation: Zhao Fei, Wang Huijuan, Zhao Gang, Wang Liang, Liu Yujuan. Wavelength Calibration of the Xinglong HRS with a Laser Frequency Comb Device of a Yb Fiber Laser[J]. Astronomical Research and Technology, 2015, 12(1): 117-126.

Wavelength Calibration of the Xinglong HRS with a Laser Frequency Comb Device of a Yb Fiber Laser

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  • Received Date: March 10, 2014
  • Revised Date: March 23, 2014
  • Published Date: January 14, 2015
  • With expasion of applications of large-aperture telescopes and high-resolution echelle gratings, more accuate wavelength calibration is becoming increasingly important, and improving wavelength-calibration accuracies emerges as an urgent issue to be resolved. A newly intrduced technique is to use LFC (Laser Frequency Comb) devices to generate standard spectra for wavelength calibration. A standard spectrum from an LFC device not only has spectral lines of highly uniform intensities/wavelength intervals, but also makes it feasible to achieve higher precisions of radial-velocity measurements of various astrophysical objects (to be on the level of a few cm/s or the relative-error level of 10-10). This should provide observational clues to a variety of important questions in astrophysics. In this paper we report the results of our first test of wavelength calibration of the Xinglong HRS (High-Resolution Spectrograph) of R-50000 by using an LFC device of a Yb fiber laser to generate the standard spectra. Our test focused on the performance of the HRS on 8 echelle orders (spanning about 550.0nm to about 590.0nm). The perforamce is measured in the characteristics of comb-line profiles and instrumental wavelength drifts. We have aslo compared our results to those of foreign research groups as preparations for optimizing and improving the LFC system.
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