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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Passive mode-locked cesium diode-pumped alkali laser.

M D Rotondaro, B V Zhdanov, M K Shaffer

    Optics Letters
    |December 23, 2022
    PubMed
    Summary

    Researchers demonstrate passive mode-locking in diode-pumped alkali lasers (DPAL) for the first time. This breakthrough uses a cesium vapor cell to generate ultrashort laser pulses, paving the way for new laser technologies.

    Area of Science:

    • Laser Physics
    • Quantum Optics
    • Materials Science

    Background:

    • Diode-pumped alkali lasers (DPALs) are efficient sources of coherent light.
    • Mode-locking is crucial for generating ultrashort laser pulses.
    • Passive mode-locking offers simpler system designs compared to active methods.

    Purpose of the Study:

    • To demonstrate passive mode-locking in a diode-pumped alkali laser (DPAL) for the first time.
    • To investigate the generation of ultrashort pulses from a passively mode-locked DPAL.
    • To characterize the performance of the developed mode-locking technique.

    Main Methods:

    • Utilized an intracavity cesium vapor cell buffered with methane for passive mode-locking.
    • Employed a continuously pumped cesium DPAL with a static gain medium.

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  • Observed pulse trains using a high-bandwidth detector (2.0 GHz).

    • Main Results:

    • Achieved passive mode-locking in a DPAL system.
    • Observed pulse durations less than 460 ps, limited by detector bandwidth.
    • Calculated a minimum pulse duration of 57 ps.

    Conclusions:

    • Successfully demonstrated the first passive mode-locking in a DPAL.
    • The technique enables the generation of ultrashort pulses from DPALs.
    • This advancement opens possibilities for compact and efficient ultrashort pulse laser sources.