Abstract
We have made a narrow band tunable filter for solar observations using a Lithium Niobate Fabry-Perot etalon. The 60 mm aperture etalon with a free spectral range of 4.22 Å and finesse of 26 at λ = 6122 Å has been procured from CSIRO, Australia. The wavelength tuning is achieved by applying high voltage to the etalon substrate at the rate of 0.45 Å per 1000 Volts. The filter is being used for imaging the sun in Hα line and obtaining Doppler- and Magnetogram in CaI 6122 Å line. In this paper, we present some initial observations carried out with this filter at Udaipur Solar Observatory.
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Debi Prasad, C., Mathew, S.K., Bhatnagar, A. et al. Solar Photospheric and Chromospheric Observations using a Lithium Niobate Fabry-Perot Etalon. Experimental Astronomy 8, 125–133 (1998). https://doi.org/10.1023/A:1007927214812
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DOI: https://doi.org/10.1023/A:1007927214812