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High-speed asynchronous optical sampling based on GHz Yb:KYW oscillators.

C Li, N Krauß, G Schäfer

    Optics Express
    |April 26, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a low-cost, high-speed asynchronous optical sampling system using Yb:KYW oscillators. The system achieves 500 fs temporal resolution and a near-shot-noise floor for advanced material characterization.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Solid-State Physics

    Background:

    • Asynchronous optical sampling (AOS) enables high-speed measurements.
    • Yb:KYW (ytterbium-doped potassium tungstate) lasers are suitable for generating ultrashort pulses.
    • Precise timing control is crucial for achieving high temporal resolution in optical sampling systems.

    Purpose of the Study:

    • To develop a cost-effective, high-speed asynchronous optical sampling system.
    • To investigate the performance limitations and capabilities of such a system.
    • To demonstrate its application in probing ultrafast phenomena in semiconductor materials.

    Main Methods:

    • Utilizing two GHz diode-pumped Yb:KYW oscillators with a slight repetition rate offset as pump and probe sources.
    • Implementing an asynchronous optical sampling scheme for high-speed data acquisition.
    • Characterizing the system's temporal resolution and noise floor.

    Main Results:

    • Achieved a temporal resolution of 500 fs, primarily limited by oscillator pulse duration and timing jitter.
    • Obtained a near-shot-noise floor of approximately 10-6 (∆R/R) within seconds of data acquisition.
    • Successfully demonstrated the system's capability by measuring coherent acoustic phonons in semiconductor samples.

    Conclusions:

    • The developed low-cost AOS system offers high-speed, high-resolution optical sampling.
    • The system is suitable for characterizing ultrafast dynamics in semiconductor devices and materials.
    • Further improvements in oscillator design could enhance the temporal resolution.