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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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100 kW peak power external cavity diamond Raman laser at 2.52 μm.

Giorgos Demetriou, Alan J Kemp, Vasili Savitski

    Optics Express
    |May 3, 2019
    PubMed
    Summary

    We developed a diamond Raman laser emitting at 2.52 μm, pumped by a Thulium laser. This breakthrough offers efficient access to the industrially significant 2.5 μm wavelength region.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Diamond Raman lasers offer potential for generating specific wavelengths.
    • Thulium (Tm) lasers are suitable pump sources for certain Raman processes.

    Purpose of the Study:

    • To demonstrate a diamond Raman laser operating at 2.52 μm.
    • To utilize a Thulium laser as a pump source for diamond Raman lasing.
    • To achieve high conversion efficiency in the 2.5 μm spectral region.

    Main Methods:

    • An external cavity configuration was employed.
    • A 1.89 μm Tm:LiYF4 (YLF) laser was used as the pump source.
    • A diamond crystal served as the Raman medium.

    Main Results:

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    • The diamond Raman laser operated at a wavelength of 2.52 μm.
    • A maximum pulse energy of 1.67 mJ was achieved with a pump energy of 4.4 mJ.
    • A peak conversion efficiency of 38% and a slope efficiency of approximately 60% were recorded.
    • Raman pulse durations ranged from 11 to 15 ns.

    Conclusions:

    • This work successfully demonstrates a Thulium laser-pumped diamond Raman laser.
    • The developed laser system provides efficient access to the industrially relevant 2.5 μm wavelength.
    • This technology holds promise for applications requiring the 2.5 μm spectral range.