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[Study on Output Frequency Stability for Optically Pumped THz Lasers].

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    Area of Science:

    • Physics
    • Optical Engineering
    • Spectroscopy

    Background:

    • Terahertz (THz) radiation source frequency stability is critical for applications such as THz imaging, radar detection, and coherent communication.
    • The two-photon light shift effect influences the frequency of optically pumped THz lasers.

    Purpose of the Study:

    • To develop a physical model and derive an analytical formula for frequency shifts in optically pumped THz lasers.
    • To quantitatively analyze the factors affecting THz laser frequency stability, including bump laser frequency offset, pump laser power, and THz cavity pressure.

    Main Methods:

    • Development of a physical model based on the two-photon light shift effect.
    • Derivation of an analytical formula for calculating THz laser frequency shifts.
    • Quantitative analysis using optically pumped methanol (CH3OH) as an example, examining methanol absorption lines under varying pressures.

    Main Results:

    • THz laser frequency drift increases with increasing bump laser power.
    • THz laser frequency drift decreases with increasing pressure within the THz cavity.
    • Maximum THz laser frequency drift occurs when the bump laser frequency drift is approximately a quarter of the absorbed line width of the operating gas, within a specific offset range.

    Conclusions:

    • Optimizing working conditions, such as pressure and temperature, is essential for improving THz laser output frequency stability.
    • Controlling the bump laser frequency shift within a defined range is a necessary measure to enhance THz laser frequency stability.