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Complex direct comb spectroscopy with a virtually imaged phased array.

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    We developed a straightforward interferometric method using a frequency-comb spectrometer to measure optical transmittance. This technique accurately reconstructs a sample

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    Area of Science:

    • Optical physics
    • Spectroscopy
    • Interferometry

    Background:

    • Accurate measurement of optical transmittance is crucial for material characterization.
    • Existing techniques may have limitations in spectral range or resolution.

    Purpose of the Study:

    • To demonstrate a simple interferometric technique for direct measurement of complex optical transmittance.
    • To reconstruct the optical transfer function of a sample over a large spectral range.

    Main Methods:

    • Utilized a frequency-comb spectrometer based on a virtually imaged phased array.
    • Employed a Michelson interferometer to encode phase deviations induced by the sample.
    • Combined interferogram images with individual arm images and frequency calibration for full reconstruction.

    Main Results:

    • Successfully measured complex optical transmittance and phase spectra.
    • Demonstrated the technique with a H13C14N vapor cell.
    • Achieved a spectral range of 2.9 THz (~23 nm) with ~1 GHz resolution.

    Conclusions:

    • The developed interferometric technique offers a simple and effective method for characterizing optical properties.
    • This approach enables direct measurement of transmittance and phase spectra with high resolution over a broad spectral range.