Abstract
A simple method to reduce the contrast of speckle structures of a random phase plate (RPP) using a harmonic conversion arrayed crystal in laser fusion is presented. A specially fabricated four-segmented arrayed KDP (potassium dihydrogen phosphate) cell is introduced. The KDP crystals in this cell were arranged to provide two groups of second harmonic light beams whose polarizations are orthogonal to each other. A reduction of the speckle contrast of 20% has been obtained in a 320 mm diameter beam of the Gekko XII laser system.
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