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@ARTICLE{Wang:827213,
      author       = {Wang, Xiaoduo and Liu, Hua and Juschkin, Larissa and Li,
                      Yunpeng and Xu, Jialin and Quan, Xiangqian and Lu, Zhenwu},
      title        = {{F}reeform lens collimating spectrum-folded {H}adamard
                      transform near-infrared spectrometer},
      journal      = {Optics communications},
      volume       = {380},
      issn         = {0030-4018},
      address      = {Amsterdam},
      reportid     = {FZJ-2017-01411},
      pages        = {161 - 167},
      year         = {2016},
      abstract     = {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.},
      cin          = {PGI-9 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / $I:(DE-82)080009_20140620$},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000382793800024},
      doi          = {10.1016/j.optcom.2016.06.009},
      url          = {https://juser.fz-juelich.de/record/827213},
}