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

Development of a new generation of low-groove density-blazed echelle gratings optimized for MIGHTI, a space-borne spatial heterodyne interferometer operating in the visible and near infrared is described. Special demands are placed on the wavefront accuracy, groove profile, and efficiency of these gratings. These demands required a new ruling for this application, with significant improvements over existing gratings. Properties of a new generation of highly efficient, plane gratings with 64  grooves/mm blazed at 8.2° are reported.

[1]  Scott Ellis,et al.  Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI): Instrument Design and Calibration , 2017, Space Science Reviews.

[2]  Fred L. Roesler,et al.  Spatial heterodyne spectroscopy for the exploration of diffuse interstellar emission lines at far-ultraviolet wavelengths , 1992 .

[3]  C. Englert,et al.  Initial ground-based thermospheric wind measurements using Doppler asymmetric spatial heterodyne spectroscopy (DASH). , 2010, Optics express.

[4]  C. Englert,et al.  Coincident thermospheric wind measurements using ground-based Doppler Asymmetric Spatial Heterodyne (DASH) and Fabry–Perot Interferometer (FPI) instruments , 2012 .

[5]  John M. Harlander,et al.  Doppler asymmetric spatial heterodyne spectroscopy (DASH): an innovative concept for measuring winds in planetary atmospheres , 2006, SPIE Optics + Photonics.

[6]  Andrew B. Christensen,et al.  Observations of molecular oxygen Atmospheric band emission in the thermosphere using the near infrared spectrometer on the ISS/RAIDS experiment , 2012 .

[7]  C. Englert,et al.  Spatial Heterodyne Imager for Mesospheric Radicals on STPSat-1 , 2010 .

[8]  Vaz Zastera,et al.  Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI): Monolithic Interferometer Design and Test , 2017, Space Science Reviews.

[9]  Leonid I Goray,et al.  Efficiencies of master, replica, and multilayer gratings for the soft-x-ray-extreme-ultraviolet range: modeling based on the modified integral method and comparisons with measurements. , 2002, Applied optics.

[10]  Wayne F. J. Evans,et al.  The Wind Imaging Interferometer (WINDII) on the Upper Atmosphere Research Satellite: A 20 year perspective , 2012 .

[11]  D. Windt,et al.  Normal-incidence efficiencies of multilayer-coated laminar gratings for the extreme-ultraviolet imaging spectrometer on the solar-B mission. , 2004, Applied optics.

[12]  C. Englert,et al.  Thermal sensitivity of DASH interferometers: the role of thermal effects during the calibration of an Echelle DASH interferometer. , 2013, Applied optics.

[13]  A. Bourassa,et al.  Temperatures in the upper mesosphere and lower thermosphere from OSIRIS observations of O2 A-band emission spectra , 2010 .

[14]  C. Englert,et al.  Doppler asymmetric spatial heterodyne spectroscopy (DASH): concept and experimental demonstration. , 2007, Applied optics.

[15]  J. Pringle,et al.  The frequency and cause of shallow winter mixed layers in the Gulf of Maine , 2012 .

[16]  E. Palik.  Handbook of Optical Constants of Solids , 1997 .