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Objective transmission gratings for large schmidt telescopes.

J Strong, F Zwicky

    Applied Optics
    |January 15, 2010
    PubMed
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    New lamellar gratings offer precise stellar spectra analysis for wide-angle telescopes. Their design allows control over missing spectral orders, enhancing astronomical observations.

    Area of Science:

    • Optics and Astronomy
    • Diffraction Grating Technology

    Background:

    • Wide-angle telescopes require efficient spectral analysis tools.
    • Traditional prisms and echelette gratings have limitations in certain applications.

    Purpose of the Study:

    • To develop and evaluate novel lamellar gratings for stellar spectroscopy.
    • To investigate the control over spectral orders using lamellar grating design.

    Main Methods:

    • Fabrication of 18-inch aperture lamellar gratings with 300 diffraction elements per inch.
    • Utilizing evaporated quartz lamellae (0.5-micron thickness) on a plane parallel plate.
    • Thermal evaporation technique for lamellae deposition.

    Main Results:

    • Central diffraction orders are missing at lambda4800 and weak at adjacent wavelengths.

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  • First-order spectra are approximately 1 magnitude weaker than those produced by prisms or echelette gratings.
  • Linear dispersion achieved, with manufacturable procedures adaptable to larger scales.

    • Conclusions:

    • Lamellar gratings provide a controllable method for stellar spectral determination.
    • The missing central order wavelength can be tuned by adjusting lamellae thickness.
    • Manufactured gratings show potential for advanced astronomical instrumentation.