The Measurement of VPHGs' Parameters for Low-resolution Spectrographs of LAMOST

Details The Measurement of VPHGs' Parameters for Low-resolution Spectrographs of LAMOST The Measurement of VPHGs' Parameters for Low-resolution Spectrographs of LAMOST

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..516x&link_type=abstract

Acta Astronomica Sinica, vol. 52, no.6, p.516-524

Astronomy and Astrophysics

Astronomy

Instrumentation: Spectrographs, Methods: Laboratory, Techniques: Spectroscopic, Telescopes

Scientific paper

The Volume Phase Holographic Grating (VPHG) is applied to astronomy in recent years, owe to its characteristic advantages. For instance, it can gain large grating,high diffraction efficiency, close to 100%, super blazing, etc. The large scientific project --- LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope), can acquire the spectra of 4000 goals from distance objects. In order to improve the transmission efficiency maximally, the VPHG is equipped as a disperse element. It is the first application in domestic astronomy. In this paper, we carry out a test of the VPHG's parameters with a high-precision device and propose the measured results such as linear density, diffraction efficiency, blazing angle, and the effect of the deviation from the blazing angle on the diffraction efficiency.

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