Modeling the partially coherent behavior of few-mode far-infrared grating spectrometers
Abstract
Modeling ultra-low-noise far-infrared grating spectrometers has become crucial for the next generation of far-infrared space observatories. Conventional techniques are awkward to apply because of the partially coherent form of the incident spectral field, and the few-mode response of the optics and detectors. We present a modal technique for modeling the behavior of spectrometers that allows for the propagation and detection of partially coherent fields, and the inclusion of straylight radiated by warm internal surfaces. We illustrate the technique by modeling the behavior of the long wavelength band of the proposed SAFARI instrument on the well-studied SPICA mission.
- Publication:
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Journal of the Optical Society of America A
- Pub Date:
- July 2022
- DOI:
- 10.1364/JOSAA.458217
- arXiv:
- arXiv:2203.11297
- Bibcode:
- 2022JOSAA..39.1218L
- Keywords:
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- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- This paper is submitted to Journal Optical Society of America A. When accepted, the paper can be found here: https://opg.optica.org/josaa/home.cfm