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    Area of Science:

    • Optical Engineering
    • Spectroscopy
    • Laser Physics

    Background:

    • Accurate atmospheric measurements require advanced spectroscopic techniques.
    • Existing methods may lack the flexibility to adapt to dynamic atmospheric conditions.
    • Frequency stepwise pulse trains (FSPT) offer potential for enhanced spectral analysis.

    Purpose of the Study:

    • To develop and demonstrate a novel frequency stepwise pulse train (FSPT) generation system.
    • To enable switchable frequency spacing for adaptive spectroscopic measurements.
    • To validate the system's performance for carbon dioxide (CO2) spectroscopy.

    Main Methods:

    • Implementation of an amplified frequency shifting loop (AFSL) with switchable frequency spacing.
    • Utilized a composite module with two acousto-optic modulators for frequency shift control.
    • Generated a 52-pulse FSPT with switchable spacing (800 MHz and 200 MHz) for CO2 absorption lines.

    Main Results:

    • Successfully generated a frequency stepwise pulse train with switchable, non-uniform frequency spacing.
    • Demonstrated the system's capability in both static and dynamic CO2 spectroscopy.
    • Achieved good agreement between experimental spectral transmittance and HITRAN database calculations.

    Conclusions:

    • The developed FSPT generation method with switchable frequency spacing is effective.
    • This technique shows significant promise for practical spectroscopy, particularly for variable atmospheres.
    • Potential applications include laser occultation and other atmospheric sensing technologies.