Volume 5 Issue 5
Oct.  2012
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AN Yan, SUN Qiang, LIU Ying, LI Chun. Design of astigmatism-free crossed Czerny-Turner spectrometer[J]. Chinese Optics, 2012, 5(5): 470-475. doi: 10.3788/CO.20120505.0470
Citation: AN Yan, SUN Qiang, LIU Ying, LI Chun. Design of astigmatism-free crossed Czerny-Turner spectrometer[J]. Chinese Optics, 2012, 5(5): 470-475. doi: 10.3788/CO.20120505.0470

Design of astigmatism-free crossed Czerny-Turner spectrometer

doi: 10.3788/CO.20120505.0470
  • Received Date: 21 Jun 2012
  • Rev Recd Date: 23 Aug 2012
  • Publish Date: 10 Oct 2012
  • The first-order astigmatism-free conditions in a crossed Czerny-Turner (C-T) structure spectrometer are derived in this paper and the optical parameters determined for a relative aperture of 1: 8 and a working range of 780 nm to 1 014 nm. An astigmatism-free crossed C-T spectrometer is built up with ZEMAX software, and a corresponding coma-free crossed C-T spectrometer is also built up for the comparison. The initial structures for the two types of crossed C-T optical systems are then optimized, and the performance merits are compared. It is shown that the astigmatism-free crossed C-T structure has superior optical performance with an RMS for the spot diagram only 12% to 52%, compared with that of the corresponding coma-free C-T structure over the working range. This indicates that the astigmatism-free crossed C-T structure possesses not only a better energy concentration along the slit direction, which is beneficial to spectrometers requiring larger condenser capacity, but also a smaller spot diameter along the direction perpendicular to the slit indicating that a higher spectrum resolution is achievable.

     

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