Abstract

The use of a Doppler asymmetric spatial heterodyne (DASH) interferometer with an Echelle grating provides the ability to simultaneously image the 558 and 630 nm emission lines (e.g., at grating orders of $n=8$ and $n=7$, respectively) of atomic oxygen in the thermosphere. By measuring the Doppler shifts of these lines (expected relative change in wavelength on the order of ${10}^{-8}$), we are able to determine the thermospheric winds. Because the expected wavelength changes due to the Doppler shift are so small, understanding, monitoring, and accounting for thermal effects is expected to be important. Previously, the thermal behavior of a temperature-compensated monolithic DASH interferometer was found to have a higher thermal sensitivity than predicted by a simple model [Opt. Express 18, 26430, 2010]. A follow-up study [Opt. Express 20, 9535, 2012] suggested that this is due to thermal distortion of the interferometer, which consists of materials with different coefficients of thermal expansion. In this work, we characterize the thermal drift of a nonmonolithic Echelle DASH interferometer and discuss the implications of these results on the use of only a single wavelength source during calibration. Furthermore, we perform a finite element analysis of the earlier monolithic interferometer in order to determine how distortion would affect the thermal sensitivity of that device. Incorporating that data into the model, we find good agreement between the modified model and the measured thermal sensitivities. These findings emphasize the fact that distortion needs to be considered for the design of thermally compensated, monolithic DASH interferometers.

© 2013 Optical Society of America

Thermally stable monolithic Doppler asymmetric spatial heterodyne interferometer: optical design and laboratory performance

Daikang Wei, Yajun Zhu, Jilin Liu, Qiucheng Gong, Martin Kaufmann, Friedhelm Olschewski, Peter Knieling, Jiyao Xu, Ralf Koppmann, and Martin Riese
Opt. Express 28(14) 19887-19900 (2020)

High-efficiency echelle gratings for MIGHTI, the spatial heterodyne interferometers for the ICON mission

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Appl. Opt. 56(8) 2090-2098 (2017)

Design and laboratory tests of a Doppler Asymmetric Spatial Heterodyne (DASH) interferometer for upper atmospheric wind and temperature observations

John M. Harlander, Christoph R. Englert, David D. Babcock, and Frederick L. Roesler
Opt. Express 18(25) 26430-26440 (2010)

Modeling and correction of fringe patterns in Doppler asymmetric spatial heterodyne interferometry

Daikang Wei, Qiucheng Gong, Qiuyu Chen, Yajun Zhu, Martin Kaufmann, Friedhelm Olschewski, Peter Knieling, Florian Dötzer, Klaus Mantel, Jiyao Xu, Ralf Koppmann, and Martin Riese
Appl. Opt. 61(35) 10528-10537 (2022)

Initial ground-based thermospheric wind measurements using Doppler asymmetric spatial heterodyne spectroscopy (DASH)

Christoph R. Englert, John M. Harlander, John T. Emmert, David D. Babcock, and Frederick L. Roesler
Opt. Express 18(26) 27416-27430 (2010)