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Mode-locked Cr(2+):ZnSe laser.

T J Carrig, G J Wagner, A Sennaroglu

    Optics Letters
    |December 7, 2007
    PubMed
    Summary
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    Researchers achieved active mode locking in a chromium-doped zinc selenide (Cr2+:ZnSe) laser. This laser system generates ultrashort, transform-limited pulses at a wavelength of 2.5 micrometers.

    Area of Science:

    • Laser Physics
    • Quantum Optics
    • Materials Science

    Background:

    • Mode-locked lasers are crucial for generating ultrashort optical pulses.
    • Chromium-doped II-VI semiconductors offer potential for mid-infrared laser development.

    Purpose of the Study:

    • To demonstrate active mode locking in a Cr(2+):ZnSe laser.
    • To characterize the output pulse properties of the mode-locked laser.

    Main Methods:

    • Active mode locking was implemented using an external modulator.
    • The Cr(2+):ZnSe laser cavity was optimized for operation near 2.5 micrometers.
    • Output pulse duration and spectral characteristics were measured.

    Main Results:

    • Achieved stable active mode locking of the Cr(2+):ZnSe laser.

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  • Generated 4.4-picosecond (ps) transform-limited pulses.
  • Obtained an average output power of 82 milliwatts (mW).

    • Conclusions:

    • Active mode locking is a viable technique for generating ultrashort pulses from Cr(2+):ZnSe lasers.
    • The demonstrated laser system shows promise for applications requiring mid-infrared ultrashort pulses.