Lithium niobate double channel Fabry-Perot interferometer for solar corona uses

Details Lithium niobate double channel Fabry-Perot interferometer for solar corona uses Lithium niobate double channel Fabry-Perot interferometer for solar corona uses

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27.5095b&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 27, Dec. 15, 1988, p. 5095-5102.

Physics

Optics

14

Fabry-Perot Interferometers, Lithium Niobates, Solar Corona, Solar Spectra, Spectral Line Width, Electro-Optical Effect, Etalons, Photosensitivity, Piezoelectric Crystals, Temperature Effects

Scientific paper

The use of a tunnable etalon in the measurement of spectral profiles of solar corona emission lines is investigated. The etalon is a y-cut plate of lithium niobate. A suitable tunning range for the line is + or - 1 A corresponding to an applied voltage of + or - 1000 V for a thickness of 0.1 mm. A passband of 0.2 A can realistically be obtained with an appropriate free spectral range of 6 A. Thermal analysis shows that a temperature excursion of 0.05 C corresponds to a spectral drift of less than 0.05 FWHM. An emission line profile is obtained by scanning an ordinary-ray passband through the emission line, while measuring the difference between this signal and that from and adjacent extraordinary-ray passband. Using polarization chopping, the scattered-light component due to the sky and instrument is efficiently removed. The extraordinary-ray (reference) passband is insensitive to the applied voltage; hence the reference signal is substantially unaffectted by the spectral modulation in the scattered light due to the solar absorption spectrum.

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