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Conventional laser versus diffusive random laser
A conventional laser cavity (left) has highly-reflecting mirrors which trap light long enough for amplification by the gain medium to be efficient. In the absence of gain, the oscillation frequencies are well-defined. In a random laser (right) the trapping of light is not achieved by mirrors, but by multiple scattering between sub-wavelength particles (red dots). Credit Hakan Türeci; Science.
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