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A new kind of mechanism of lasing is investigated experimentally. It is quitedifferent from the traditional laser with cavity and the random laser withrandom scattering. In this mechanism, the intensity-dependent refractive indexeffect and thermal lensing effects of the pump beam induce a large gradient ofthe refractive index in the gain material, which forms a passive equivalentboundary that provides the feedback in the lasing system. A real lasing system,a liquid disk laser, is performed, it achieves 2-D omnidirectional radiationwith a high efficiency of 28%, its radiation spectral property can be explainedby resonant Raman scattering.

A lasing mechanism based on absorption boundary of gain materials