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Self-diffraction of two types has been discovered in the case of resonant excitation of excitons in CdSe/ZnS quantum dots (highly absorbing colloidal solution) by two intersecting high-power second harmonic beams of mode-locked laser with picosecond pulse duration. The physical processes responsible for the nonlinear optical properties of CdSe/ZnS quantum dots and for the arising self-action effects are discussed.