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    Area of Science:

    • Non-linear optics
    • Quantum optics
    • Semiconductor device physics

    Background:

    • Semiconductor Bragg-reflection waveguides (BRWs) are crucial for non-linear optics.
    • Controlling spatial modes in BRWs is essential for quantum optical functionalities.
    • Existing characterization methods may not fully capture the properties of these complex waveguides.

    Purpose of the Study:

    • To develop and apply an efficient broadband spectral method for characterizing dispersive multimode semiconductor waveguides.
    • To gain direct experimental access to the relevant spatial modes within BRWs.
    • To determine the group velocities and loss coefficients of these waveguides.

    Main Methods:

    • Extension of the Fabry-Perot technique for linear optical characterization.
    • Broadband spectral analysis of semiconductor Bragg-reflection waveguides.
    • Experimental determination of spatial mode properties, including group velocities and loss.

    Main Results:

    • Detailed linear optical characterization of dispersive multimode semiconductor waveguides was achieved.
    • Direct experimental access to relevant spatial modes and their group velocities was obtained.
    • Lower than expected loss coefficients were measured for the waveguides.

    Conclusions:

    • The developed Fabry-Perot based method provides efficient characterization of BRWs.
    • The low loss coefficients indicate suitability for integrated quantum optics.
    • Precise control over spatial modes is achievable, paving the way for advanced quantum applications.