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Broadly tunable compact continuous-wave Cr(2+):ZnS laser.

Irina T Sorokina, Evgeni Sorokin, Sergey Mirov

    Optics Letters
    |November 21, 2007
    PubMed
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    We developed a compact, tunable chromium-doped zinc sulfide (Cr2+:ZnS) laser operating at room temperature. This novel laser offers continuous-wave output and demonstrates efficient performance, paving the way for new optical applications.

    Area of Science:

    • Materials Science
    • Laser Physics
    • Quantum Electronics

    Background:

    • Chromium-doped chalcogenides are promising gain media for mid-infrared lasers.
    • Previous research focused on Cr2+:ZnSe, but challenges with polarization and thermal properties exist.

    Purpose of the Study:

    • To develop a continuous-wave, room-temperature Cr2+:ZnS laser.
    • To investigate its performance characteristics and compare it with Cr2+:ZnSe.
    • To explore sensitization effects for enhanced laser output.

    Main Methods:

    • Continuous-wave laser operation of Cr2+:ZnS was achieved using diode-pumped Er-fiber laser pumping.
    • Direct diode pumping at 1.6 microm was also investigated.
    • Performance metrics including output power, slope efficiency, and tuning range were measured.

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  • Cr2+:ZnS was compared to Cr2+:ZnSe in a similar laser setup.
  • Sensitization effects using visible and near-infrared radiation were observed.

    • Main Results:

    • A compact, room-temperature Cr2+:ZnS laser tunable over 700 nm was developed.
    • Under Er-fiber laser pumping, 0.7 W of linearly polarized output at 2.35 microm with 40% slope efficiency was achieved.
    • Direct diode pumping at 1.6 microm yielded 25 mW of polarized, 400 nm tunable output.
    • Cr2+:ZnS exhibited intrinsic polarization, unlike Cr2+:ZnSe.
    • Laser output was sensitized by visible (470-500 nm) and near-infrared (740-770 nm) radiation.

    Conclusions:

    • Cr2+:ZnS is a viable gain medium for compact, tunable, room-temperature lasers.
    • Its intrinsic polarization offers advantages over Cr2+:ZnSe.
    • Further research into sensitization could enhance laser performance.