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Speckle reduction characterization of high power broad-area edge-emitting diodes lasers

We investigated the speckle contrast reduction characterization of high power broad-area edge-emitting red and blue laser. The speckle contrast is measured with different pulse driving conditions. It can be observed from the measurement that the speckle contrast reduces with the increasing of pulse duration and pulse amplitude. The highest speckle contrast reduction that can be achieved with the red and the blue lasers is 27.9% and 10.4% respectively. The reduction of speckle contrast is due to the shift of emission wavelength and the incoherence of the laser beam at high driving current.