DOTIFS: Spectrograph optical and opto-mechanical design

Haeun Chung, A. N. Ramaprakash, Pravin Khodade, Deepa Modi, Chaitanya V. Rajarshi, Sabyasachi Chattopadhyay, Pravin A. Chordia, Vishal Joshi, Sungwook E. Hong, Amitesh Omar, Swara Ravindranath, Yong Sun Park, Changbom Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS) is a new multi-Integral Field Unit (IFU) instrument, planned to be mounted on the 3.6m Devasthal optical telescope in Nainital, India. It has eight identical, fiber-fed spectrographs to disperse light coming from 16 IFUs. The spectrographs produce 2,304 spectra over a 370-740nm wavelength range simultaneously with a spectral resolution of R=1200-2400. It is composed of all-refractive, allspherical optics designed to achieve on average 26.0% throughput from the telescope to the CCD with the help of high transmission spectrograph optics, volume phase holographic grating, and graded coated e2v 2K by 4K CCD. We present the optical and opto-mechanical design of the spectrograph as well as current development status. Optics and optomechanical components for the spectrographs are being fabricated.

Original languageEnglish (US)
Title of host publicationGround-based and Airborne Instrumentation for Astronomy VII
EditorsLuc Simard, Luc Simard, Christopher J. Evans, Hideki Takami
ISBN (Print)9781510619579
StatePublished - 2018
Externally publishedYes
EventGround-based and Airborne Instrumentation for Astronomy VII 2018 - Austin, United States
Duration: Jun 10 2018Jun 14 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherGround-based and Airborne Instrumentation for Astronomy VII 2018
Country/TerritoryUnited States


  • Devasthal Optical Telescope
  • Graded coating CCD
  • Integral field unit
  • Multi-IFU
  • Optical fiber
  • Optical spectrograph
  • Volume Phase Holographic Grating
  • and Nearby galaxies

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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