DEEM, a versatile platform of FRD measurement for highly multiplexed fibre systems in astronomy

doi:10.1093/mnras/sty461

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	DEEM, a versatile platform of FRD measurement for highly multiplexed fibre systems in astronomy
	Yan, Yunxiang 1,2; Yan, Qi 3; Wang, Gang 1; Sun, Weimin 3; Luo, A-Li 1; Ma, Zhenyu 3; Zhang, Qiong 3; Li, Jian 1; Wang, Shuqing 1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-06-01
卷号	476 期号:4 页码:4279-4314
关键词	instrumentation: miscellaneous instrumentation: spectrographs methods: data analysis techniques: miscellaneous techniques: spectroscopic
ISSN号	0035-8711
DOI	10.1093/mnras/sty461
英文摘要	We present a new method of DEEM, the direct energy encircling method, for characterizing the performance of fibres in most astronomical spectroscopic applications. It is a versatile platform to measure focal ratio degradation (FRD), throughput, and point spread function. The principle of DEEM and the relation between the encircled energy and the spot size were derived and simulated based on the power distributionmodel (PDM). We analysed the errors of DEEM and pointed out the major error source for better understanding and optimization. The validation of DEEM has been confirmed by comparing the results with conventional method which shows that DEEM has good robustness with high accuracy in both stable and complex experiment environments. Applications on the integral field unit (IFU) show that the FRD of 50 mu m core fibre is substandard for the requirement which requires the output focal ratio to be slower than 4.5. The homogeneity of throughput is acceptable and higher than 85 per cent. The prototype IFU of the first generation helps to find out the imperfections to optimize the new design of the next generation based on the staggered structure with 35 mu m core fibres of N.A. = 0.12, which can improve the FRD performance. The FRD dependence on wavelength and core size is revealed that higher output focal ratio occurs at shorter wavelengths for large core fibres, which is in agreement with the prediction of PDM. But the dependence of the observed data is weaker than the prediction.
WOS关键词	FOCAL-RATIO DEGRADATION ; OPTICAL-FIBERS ; HIGH-RESOLUTION ; MODAL NOISE ; FIELD UNIT ; INSTRUMENTATION ; TEMPERATURES ; SPECTROGRAPH ; SELECTION ; DESIGN
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000432659800001
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/21744]
专题	中国科学院国家天文台
通讯作者	Yan, Yunxiang; Sun, Weimin
作者单位	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Harbin Engn Univ, Key Lab Infiber Integrated Opt, Minist Educ China, Harbin 150001, Heilongjiang, Peoples R China
推荐引用方式 GB/T 7714	Yan, Yunxiang,Yan, Qi,Wang, Gang,et al. DEEM, a versatile platform of FRD measurement for highly multiplexed fibre systems in astronomy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,476(4):4279-4314.
APA	Yan, Yunxiang.,Yan, Qi.,Wang, Gang.,Sun, Weimin.,Luo, A-Li.,...&Wang, Shuqing.(2018).DEEM, a versatile platform of FRD measurement for highly multiplexed fibre systems in astronomy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,476(4),4279-4314.
MLA	Yan, Yunxiang,et al."DEEM, a versatile platform of FRD measurement for highly multiplexed fibre systems in astronomy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 476.4(2018):4279-4314.