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It has been conjectured that little string theories in six dimensions are holographic to critical string theory in a linear dilaton background. We test this conjecture for theories arising on the worldvolume of heterotic fivebranes. We compute the spectrum of chiral primaries in these theories and compare with results following from type-I-heterotic duality and the AdS/CFT correspondence. We also construct holographic duals for heterotic fivebranes near orbifold singularities. Finally we find several new little string theories which have Spin(32)/Z 2 or E 8 × E 8 global symmetry but do not have a simple interpretation either in heterotic or M-theory.

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It is shown for the first time that the balance between self-phase-modulation (SPM) and gain saturation in an active medium of a solid-state laser with a limited gain bandwidth can generate a chirped frequency-shifted quasisoliton. Introduction of additional amplitude or phase modulation stabilises this quasisoliton.

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