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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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High-performance 1-10  THz integrating sphere.

Chun-Lun Wang, Chuang-Pin Chiu, Pin-Jie Huang

    Applied Optics
    |May 13, 2021
    PubMed
    Summary

    Researchers developed a novel terahertz integrating sphere for the SPICA far-infrared instrument (SAFARI). This calibration source achieves high reflectance (0.91) crucial for space-based infrared astronomy.

    Area of Science:

    • Astronomy and Astrophysics
    • Optical Engineering
    • Terahertz Science

    Background:

    • The SPICA far-infrared instrument (SAFARI) requires a calibration source for its transition edge sensor readout circuits.
    • High-performance integrating spheres operating at 34-230 µm are essential for SAFARI's calibration needs.

    Purpose of the Study:

    • To develop a novel process for preparing terahertz integrating spheres.
    • To create a high-performance calibration source for the SPICA far-infrared instrument (SAFARI).

    Main Methods:

    • A novel preparation process involving sandblasting, wet-etching, and gold plating of aluminum surfaces was developed.
    • Characterization of surface morphology and reflectance in the 1-10 THz range.
    • Numerical simulations of output power distribution were performed.

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    Main Results:

    • The developed process resulted in aluminum surfaces with rough morphology but high reflectance (0.91) at terahertz frequencies.
    • Measured output power distribution closely matched numerical simulation results.
    • The integrating sphere is suitable for SAFARI's operational wavelengths (34-230 µm).

    Conclusions:

    • A novel method for creating terahertz integrating spheres with high reflectance has been successfully demonstrated.
    • The developed integrating sphere meets the performance requirements for calibrating the SPICA far-infrared instrument (SAFARI).
    • The findings support the advancement of infrared astronomy instrumentation.