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Widely tunable frequency conversion in monolithic semiconductor waveguides at 2.4  μm.

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    Researchers generated widely tunable continuous-wave light using difference-frequency generation in a semiconductor waveguide. This tunable coherent radiation source has potential for on-chip spectroscopy and environmental monitoring.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Devices
    • Nonlinear Optics

    Background:

    • Tunable coherent light sources are crucial for various spectroscopic and sensing applications.
    • Semiconductor-based photonic devices offer miniaturization and integration potential for light generation.

    Purpose of the Study:

    • To demonstrate a widely tunable, continuous-wave (CW) light source operating in the 2-3 μm wavelength range.
    • To utilize difference-frequency generation (DFG) in a monolithic semiconductor waveguide for efficient light generation.

    Main Methods:

    • Employed difference-frequency generation (DFG) in a type-II phase-matched monolithic semiconductor waveguide.
    • Utilized a pump laser tuned between 938-952 nm and a signal laser tuned between 1490-1590 nm.
    • Incorporated a single-sided Bragg reflection waveguide design.

    Main Results:

    • Achieved continuous-wave widely tunable light generation spanning 2360 to 2530 nm.
    • Estimated the device's internal conversion efficiency at 0.29% W⁻¹ cm⁻².
    • Demonstrated a tunable source of coherent radiation in the desired 2-3 μm wavelength range.

    Conclusions:

    • The developed semiconductor waveguide is a promising platform for generating tunable coherent radiation.
    • The device's design is suitable for on-chip spectroscopy and environmental monitoring.
    • This technology enables compact and integrated tunable light sources for sensing applications.