18 December 2000 Tunable Fabry-Perot etalons for the 120- to 150-nm wavelength range
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Abstract
Tunable UV Fabry-Perot etalons have the potential of providing images, dopplergrams, and density maps of the Sun's upper chromosphere and transition region. To study the feasibility of this approach, we developed and built tunable laboratory etalons for the 135 - 141 and 120 - 123 nm wavelength ranges. At 140 nm we achieved a finesse of 10.5 and a peak transmission of 3 percent. This performance is sufficient to observe the density sensitive line pair of O IV at 140.4 and 140.7 nm. At 122 nm (H Lyman alpha) we achieved a finesse of 3.8 and a peak transmission of 0.07 percent.
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Jean-Pierre Wuelser, Jean-Pierre Wuelser, William J. Rosenberg, William J. Rosenberg, Marilyn E. Bruner, Marilyn E. Bruner, } "Tunable Fabry-Perot etalons for the 120- to 150-nm wavelength range", Proc. SPIE 4139, Instrumentation for UV/EUV Astronomy and Solar Missions, (18 December 2000); doi: 10.1117/12.410537; https://doi.org/10.1117/12.410537
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