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The wide spectrum laser has a rare earth laser source (6) with a luminous pump flux (9) centered on the flux wavelength and transmitted by a solid pump laser source (8). The primary source has an active material and transmits a luminous primary flux (7) centered on the spectral width wavelength. There is a photonic crystal fibre (2) having a cavity assembly, and optical injection (10) sending the luminous primary flux into the photonic crystal fibre.