We report on an experimental study aimed to suppress the speckle structure produced by a coherent optical field. The technique proposed is based on the reduction of a laser output coherence utilizing enriching the emission spectrum lines. We achieved a temperature-controlled simultaneous emission of two components at 1.064 m and 1.066 m with nearly equal intensities in IR from diode-pumped Nd:YVO4 laser with intracavity second-harmonic generation The emission lines 532 nm, 532.6 nm and 533.1 nm were recorded in the second-harmonic output. The influence of the spectrum variation on the formation of a speckle field was checked. We succeeded to remove intensity zeroes and reduce the contrast (visibility) from 0.92 to 0.65 in a light scattered by a ground glass diffuser at the angle 35°. A simple consideration of the speckle field dumping mechanism is presented.
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