Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.122....1i&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 122, no. 1, May 1986, p. 1-32.
Astronomy and Astrophysics
Astrophysics
2
Astronomical Spectroscopy, Light Transmission, Linear Polarization, Spectrographs, Dielectrics, Slits, Transmission Efficiency, Transverse Waves, Wave Attenuation
Scientific paper
Using a 250-W high pressure Hg-vapor arc lamp light source, the linear polarization produced by astronomical spectrograph slit light transmission is investigated. A parallel beam of plane polarized light was rotated in the measuring system using a half-wave plate, and the intensity of normally incident 0.436-micron wavelength polarized light transmitted by various slits was measured as a function of slit width. Results for a metallic slit show that the degree of polarization increased both as the depth narrow slit depth increased, and as the narrow slit width decreased, and that when the slit width was widened the degree of polarization tended to asymptotically approach a constant value. The Slater (1942) theoretical calculations predicted the measured experimental values more accurately than those of Thiessen (1947) and Jones and Richards (1954), and good general agreement is found with electromagnetic light theory propagation losses. No advangtage is seen in using a dielectric slit.
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