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The distributed-feedback (DFB) colour centre laser is described. The DFB laser action at 680 nm is observed by pumping on LiF crystal containing F2 centres with the fringes formed by the interference of two coherent light beams.

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We report on a distributed-feedback (DFB) color center laser based on N2 centers in KCl. A periodic grating with fringe spacings as fine as 440 nm was produced by means of a two-photon coloration process using two interfering beams. Coloration and photoaggregation processes and the DFB laser action can be availed by the fourth- and second-harmonic and the fundamental lines of a Q-switched Nd:YAG laser, respectively. The linewidth of the DFB output is less than 0.3 nm in the spectrally important 1300 nm region.

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