Optical design and wavelength calibration of a DMD-based multi-object spectrograph

Shaojie Chen; Matthew C. H. Leung; Xuefeng Yao; Suresh Sivanandam; Isabelle Sanders; Rosalind Liang

doi:10.1117/12.2630372

29 August 2022 Optical design and wavelength calibration of a DMD-based multi-object spectrograph

Shaojie Chen, Matthew C. H. Leung, Xuefeng Yao, Suresh Sivanandam, Isabelle Sanders, Rosalind Liang

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 1218856 (2022) https://doi.org/10.1117/12.2630372
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The multi-object spectrograph (MOS) has been the benchmark for the current generation of astronomical spectrographs, valued for its ability to acquire the spectra of hundreds of objects simultaneously. In the last two decades, the digital micromirror device (DMD) has shown potential in becoming the central component of the MOS, being used as a programmable slit array. We have designed a seeing-limited DMD-based MOS covering a spectral range of 0.4 to 0.7 μm, with a field of view (FOV) of 10.5’ ×13.98’ and a spectral resolution of R ∼ 1000. This DMD-MOS employs all-spherical refractive optics, and a volume phase holographic (VPH) grism as the dispersive element for high throughput. In this paper, we present the optical design and optimization process of this DMD-MOS, as well as a preliminary wavelength calibration procedure for hyperspectral data reduction. Using simulated data of the DMD-MOS, a procedure was developed to measure hyperspectral imaging distortion and to construct pixel-to-wavelength mappings on the detector. An investigation into the relationships between DMD micromirrors and detector pixels was conducted. This DMD-MOS will be placed on a 0.5 m diameter telescope as an exploratory study for future DMD-based MOS systems.

Citation Download Citation

Shaojie Chen, Matthew C. H. Leung, Xuefeng Yao, Suresh Sivanandam, Isabelle Sanders, and Rosalind Liang "Optical design and wavelength calibration of a DMD-based multi-object spectrograph", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 1218856 (29 August 2022); https://doi.org/10.1117/12.2630372

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