On application of holographic diffraction structures for phase control of multiaperture optical telescope systems

Details On application of holographic diffraction structures for phase control of multiaperture optical telescope systems On application of holographic diffraction structures for phase control of multiaperture optical telescope systems

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994optsp..76..107k&link_type=abstract

Optics and Spectroscopy (English translation of Op tika i Spektroskopiya) (ISSN 0030-400X), vol. 76, no. 1, p. 107-110

Physics

Optics

Astronomical Interferometry, Gratings (Spectra), Holographic Interferometry, Interferometers, Phase Control, Synthetic Apertures, Telescopes, Geometrical Optics, Light Beams, Tolerances (Mechanics)

Scientific paper

A holographic system for phase control of multimodular optical synthetic-aperture telescopes is proposed. The system is based on the well-known achromatized diffraction-grating interferometer scheme. Results are presented of a theoretical study of a model of the control system that involves three planar transmitting diffraction gratings with constant spacings oriented in the same direction. It is shown that if the holographic system is illuminated by an infinitely distant nonmonochromatic radiation source, the result of noncoherent addition of phase-matched co-oriented monochromatic interference patterns of light beams transmitted through different modules will be observed in the focal plane of the telescope. The ratio of the phase increment of the interference pattern to the change of radiation wavelength illuminating the control unit that causes the increment, which can be measured at any fixed point of the focal plane, is proposed as the phase control criterion. Expressions describing the dependence of the phase control accuracy on tolerances on geometrical parameters of the modules are presented.

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