【摘要】 对LAMOST(Large Sky Area Multi-Object Fiber Spectroscopic Telescope)16台低分辨率光谱仪共34块体位相全息光栅(VPHG)的参数进行了系统测试,给出了测试方法和测量结果,测量参数包括光栅的刻线密度、闪耀角、衍射效率曲线以及闪耀角偏差对衍射效率的影响等,测量的数据为LAMOST光谱仪的安装提供了依据.更多还原

【Abstract】 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.更多还原