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Speckle noise reduction based on induced mode Hopping in a semiconductor laser diode by drive current modulation

机译:基于驱动电流调制的半导体激光二极管中基于感应模式跳跃的斑点噪声降低

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摘要

We propose and demonstrate a speckle reduction technique in a laser diode projection system. By modulating the drive current of the laser diode continuously, we manage to generate independent longitudinal modes that arise from mode hopping. Since these modes have no fixed relationship between each other they act as independent sources which results in speckle reduction in the image. We experimentally demonstrate a speckle reduction factor of 2.17, which is in excellent agreement with our theoretical expectations. We conclude that mode hopping in laser systems can be used effectively to suppress speckle noise. (C) 2015 Elsevier Ltd. All rights reserved.
机译:我们提出并演示了激光二极管投影系统中的斑点减少技术。通过连续调制激光二极管的驱动电流,我们设法产生了由模式跳跃引起的独立纵向模式。由于这些模式之间没有固定的关系,因此它们充当独立的来源,从而导致图像中的斑点减少。我们实验证明散斑减少因子为2.17,这与我们的理论预期非常吻合。我们得出的结论是,激光系统中的模式跳变可以有效地抑制斑点噪声。 (C)2015 Elsevier Ltd.保留所有权利。

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