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Common-path spectral interferometry for single-shot terahertz electro-optics detection.

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    We developed a common-path spectral interferometer for terahertz (THz) electro-optics (EO) detection. This novel design significantly improves signal-to-noise ratio by over 5 times compared to traditional methods.

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    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Science and Technology
    • Electro-Optics (EO)

    Background:

    • Traditional spectral interferometers often suffer from noise due to environmental fluctuations.
    • Non-common-path designs are particularly susceptible to mechanical vibrations and air turbulence.
    • Improving signal-to-noise ratio (SNR) is crucial for sensitive THz electro-optic detection.

    Purpose of the Study:

    • To propose and demonstrate a common-path spectral interferometer for single-shot THz electro-optic detection.
    • To enhance the signal-to-noise ratio (SNR) in THz measurements.
    • To reduce noise introduced by environmental factors in spectral interferometry.

    Main Methods:

    • Generated orthogonally polarized probe pulse pairs with a time delay using a birefringent plate.
    • Utilized one pulse as the object beam (transmitting through THz EO crystal) and the other as the reference beam.
    • Employed co-axial propagation of the pulse pair to minimize environmental noise.

    Main Results:

    • Achieved a single-shot THz signal-to-noise ratio (SNR) of 41.2 with the common-path interferometer.
    • The traditional Mach-Zehnder interferometer yielded an SNR of 7.91 for the same THz field.
    • Demonstrated an improvement in SNR by approximately 5.2 times compared to the Mach-Zehnder design.

    Conclusions:

    • The proposed common-path spectral interferometer effectively reduces noise in THz electro-optic detection.
    • This design offers a significant SNR enhancement for single-shot THz measurements.
    • The common-path approach provides a robust and sensitive method for THz electro-optic sensing.