Without a well-defined cavity, there is no obvious way to control the resonant modes in a random laser. Experiments now show that shaping the optical pump allows for controlled single-mode operation at predetermined lasing wavelengths.
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Rotter, S. Playing pinball with light. Nature Phys 10, 412–413 (2014). https://doi.org/10.1038/nphys2960
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DOI: https://doi.org/10.1038/nphys2960
