Modelling high resolution Echelle spectrographs for calibrations: Hanle Echelle spectrograph, a case study

@article{Chanumolu2015ModellingHR,
  title={Modelling high resolution Echelle spectrographs for calibrations: Hanle Echelle spectrograph, a case study},
  author={Anantha Chanumolu and Damien J. Jones and Sivarani Thirupathi},
  journal={Experimental Astronomy},
  year={2015},
  volume={39},
  pages={423-443}
}
We present a modelling scheme that predicts the centroids of spectral line features for a high resolution Echelle spectrograph to a high accuracy. Towards this, a computing scheme is used, whereby any astronomical spectrograph can be modelled and controlled without recourse to a ray tracing program. The computations are based on paraxial ray trace and exact corrections added for certain surface types and Buchdahl aberration coefficients for complex modules. The resultant chain of paraxial ray… 
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