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VOLUME 29 (1979) | ISSUE 5 | PAGE 276
Experimental investigation of beam collapse during the self-focusing in a nonlinear medium
The nature of beam collapse in a nonlinear Kerr medium was studied. The photometrically measured absolute density distribution of energy passed through the focus was used to study the nature of the field Ε ~ 1 /(|z — zf\a). We obtained the values of α and compared them with theory. We show that the size of the focus may substantially differ from the size of the beam track. We show the existence and evaluate the length of the waveguide extension behind the moving focus which causes the focus to actually form a part of the waveguide.