Wavelength calibration of a tunable spatial heterodyne spectrometer

K. Nirmal; Sridharan R.; S. Sriram; Suresh Ambily; Joice Mathew; Mayuresh Sarpotdar; Jayant Murthy; Binukumar Gopalakrishnan; Margarita Safonova

doi:10.1117/12.2312454

6 July 2018 Wavelength calibration of a tunable spatial heterodyne spectrometer

K. Nirmal, Sridharan R., S. Sriram, Suresh Ambily, Joice Mathew, Mayuresh Sarpotdar, Jayant Murthy, Binukumar Gopalakrishnan, Margarita Safonova

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107024V (2018) https://doi.org/10.1117/12.2312454
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to Fourier transform spectroscopy and shares design similarities with a Michelson Interferometer. An Imaging detector is used at the output of a SHS to record the spatially heterodyned interference pattern. The spectrum of the source is obtained by Fourier transforming the recorded interferogram. The merits of the SHS -its design, including the lack of moving parts, compactness, high throughput, high SNR and instantaneous spectral measurements - makes it suitable for space as well as ground observatories. The small bandwidth limitation of the SHS can be overcome by building it in tunable configuration (Tunable Spatial Heterodyne Spectrometer(TSHS)). In this paper, we describe the wavelength calibration of the tunable SHS using a Halogen lamp and Andor monochromator setup. We found a relation between the fringe frequency and the wavelength.

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K. Nirmal, Sridharan R., S. Sriram, Suresh Ambily, Joice Mathew, Mayuresh Sarpotdar, Jayant Murthy, Binukumar Gopalakrishnan, and Margarita Safonova "Wavelength calibration of a tunable spatial heterodyne spectrometer", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107024V (6 July 2018); https://doi.org/10.1117/12.2312454

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