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Light in the darkness

Laser light is usually limited to the same wavelength range as the spontaneous emission of the active material. A judicious choice of dielectric coatings on the cavity has now enabled laser emission far beyond the spectral range of the gain medium.

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Fig. 1: Laser emission inside and outside the spontaneous emission band.


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Correspondence to Alessandra Toncelli.

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Toncelli, A. Light in the darkness. Nat. Phys. 18, 1271–1272 (2022).

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