Optical tests of thin plastic films

Details Optical tests of thin plastic films Optical tests of thin plastic films

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104.1239b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 682, p. 1239-1243.

Computer Science

Performance

3

Fabry-Perot Interferometers, Optical Properties, Polymeric Films, Telescopes, Thin Films, Atmospheric Windows, Performance Tests, Plastic Coatings, Wave Fronts

Scientific paper

We have studied the optical characteristics of several plastic films. Interferometry of large (1.4 m diameter) and small (10 cm) samples shows that thin polyester (Mylar) films have rms wave front deviations small enough (about lambda/20 optical path difference) that they are essentially diffraction-limited. Although they introduce scattered light, it is less than the scattered light from a glass mirror and the atmosphere. Mylar is strongly birefringent, a serious inconvenience for measurements of polarized light. Besides scattering light, Mylar absorbs and reflects light and spectrally modulates it with small ripples due to a Fabry-Perot effect.

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