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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Spectroscopy

    Background:

    • Spectral phase characterization is vital for ultrashort laser pulses in nonlinear micro-spectroscopy.
    • Retrieving the spectral phase of mid-infrared (MIR) pulses is challenging and less common than for near-infrared (NIR) pulses.

    Purpose of the Study:

    • To determine the spectral phase of ultra-broadband MIR pulses over an extended spectral range (>1000 cm⁻¹).
    • To adapt and apply the d-scan method for MIR pulse characterization.

    Main Methods:

    • Exploitation of the d-scan method in two distinct variants: dual d-scan and Xd-scan.
    • Utilizing the interaction between MIR and NIR pulses to achieve high signal detection.
    • Differential dispersion imprinting: dual d-scan affects both pulses, while Xd-scan disperses only the NIR pulse.

    Main Results:

    • Successful determination of the spectral phase for ultra-broadband MIR pulses.
    • Demonstration of the d-scan method's applicability to MIR spectral phase retrieval.
    • Achieved phase retrieval over a spectral range exceeding 1000 cm⁻¹.

    Conclusions:

    • The presented d-scan variants offer a robust approach for MIR spectral phase characterization.
    • This work expands the capabilities of nonlinear micro-spectroscopy by enabling MIR pulse analysis.
    • The method facilitates advanced studies requiring precise control and understanding of MIR ultrashort pulses.