TY  - JOUR
AU  - Wang, Xiaoduo
AU  - Liu, Hua
AU  - Juschkin, Larissa
AU  - Li, Yunpeng
AU  - Xu, Jialin
AU  - Quan, Xiangqian
AU  - Lu, Zhenwu
TI  - Freeform lens collimating spectrum-folded Hadamard transform near-infrared spectrometer
JO  - Optics communications
VL  - 380
SN  - 0030-4018
CY  - Amsterdam
M1  - FZJ-2017-01411
SP  - 161 - 167
PY  - 2016
AB  - A novel Hadamard transform spectrometer collimated by a freeform lens has been designed, which doubles the working spectral range while the spectral resolution is maintained. The freeform lens is designed to redistribute the broadband spectra of the source from 800 nm to 2400 nm into two collimated beams with different wavelengths and different tilting angles, to achieve the folding of spectra on the digital micro-mirror devices (DMD). It is constructed by solving two partial differential equations. The grating diffraction efficiency of the two split beams are more uniform and higher compared with the traditional method. The simulation results show that the bandwidth of the spectrometer is doubled and the spectral resolution is better than 10 nm. The optical system becomes more compact, and the energy efficiency is improved by 11.98% by folding the spectra with one freeform lens and one grating.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000382793800024
DO  - DOI:10.1016/j.optcom.2016.06.009
UR  - https://juser.fz-juelich.de/record/827213
ER  -