9 August 2016 Wide field of view spectroscopy using solid Fabry-Perot interferometers
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Abstract
We present a high resolution spectrometer consisting of dual solid Fabry-Perot Interferometers (FPI). Each FPI is made of a single piece of L-BBH2 glass which has a high index of refraction n~2.07. Each is then coated with partially reflective mirrors to achieve a spectral resolution of R~30,000. Running the FPIs in tandem reduces the overlapping orders and allows for a much wider free spectral range and higher contrast. Tuning of the FPIs is achieved by adjusting the temperature and thus changing the FPI gap and the refractive index of the material. The spectrometer then moves spatially in order to get spectral information at every point in the field of view. We select spectral lines for further analysis and create maps of the line depths across the field. Using this technique we are able to measure the fluorescence of chlorophyll in plants and observe zodiacal light. In the chlorophyll analysis we are able to detect chlorophyll fluorescence using the line depth in a plant using the sky as a reference solar spectrum. This instrument has possible applications in either a cubesat or aerial observations to measure bulk plant activity over large areas.
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Jonathan Nikoleyczik, Jonathan Nikoleyczik, Alexander Kutyrev, Alexander Kutyrev, Harvey Moseley, Harvey Moseley, Sylvain Veilleux, Sylvain Veilleux, } "Wide field of view spectroscopy using solid Fabry-Perot interferometers", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99085N (9 August 2016); doi: 10.1117/12.2232864; https://doi.org/10.1117/12.2232864
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