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Experimentally, it turns out that radiation forces from a cw-laser on aliquid-liquid interface are able to produce giant deformations (up to about100\mu m), if the system is close to the critical point where the surfacetension becomes small. We present a new model for such a fingerlikedeformation, implying that the system is described as an optical fiber. Onereason for introducing such a model is that the refractive index difference inmodern experiments, such as those of the Bordeaux group, is small, of the sameorder as in practical fibers in optics. It is natural therefore, to adopt thehybrid HE_{11} mode, known from fiber theory, as the fundamental mode for theliquid system. We show how the balance between hydrodynamical and radiationforces leads to a stable equilibrium point for the liquid column. Also, wecalculate the narrowing of the column radius as the depth increases. Comparisonwith experimental results of the Bordeaux group yields quite satisfactoryagreement as regards the column width.

Nonlinear Laser-Induced Deformations of Liquid-Liquid Interfaces: an Optical Fiber Model