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    We developed a cavity-enhanced sum-frequency generation (SFG) system for efficient infrared (IR) signal upconversion. This GHz-bandwidth upconverter offers enhanced sensitivity for optical communications without cooling.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics

    Background:

    • Infrared (IR) signal detection often requires cryogenic cooling for sensitive, high-speed applications.
    • Sum-frequency generation (SFG) is a nonlinear optical process used for frequency conversion.

    Purpose of the Study:

    • To demonstrate efficient upconversion of modulated IR signals to visible frequencies using cavity-enhanced SFG.
    • To achieve a wide bandwidth (over 1 GHz) for IR signal upconversion.
    • To explore the use of this technology as a cooling-free alternative to traditional IR detectors.

    Main Methods:

    • Utilizing a periodically poled lithium niobate (PPLN) crystal within a resonant cavity.
    • Generating intensity-modulated IR signals by combining two narrow-linewidth lasers at 1547 nm.
    • Employing a unidirectional Nd:YVO4 ring cavity to provide high-power (up to 150 W) 1064 nm circulating pump.
    • Analyzing the spectral stability and RF spectrum of the upconverted signal.

    Main Results:

    • Achieved efficient upconversion of modulated IR signals with bandwidths exceeding 1 GHz.
    • Demonstrated enhanced spectral stability by transitioning from multimode to single longitudinal mode pumping.
    • Identified and analyzed the detrimental effects of multimode pumping on the upconverted signal's RF spectrum.
    • Confirmed the system's potential for high-speed optical communications.

    Conclusions:

    • Cavity-enhanced SFG provides a viable method for high-bandwidth IR signal upconversion.
    • The developed system offers enhanced sensitivity without the need for cooling.
    • This technology can be extended to the mid-IR range, serving as an alternative to cooled semiconductor detectors for applications like free-space optical communications.