Abstract Fast speckle suppression is crucial for time-resolved full-field imaging with laser illumination. Here, we introduce a method to accelerate the spatial decoherence of laser emission, achieving speckle suppression in the nanosecond integration time scale. The method relies on the insertion of an intracavity phase diffuser into a degenerate cavity laser to break the frequency degeneracy of transverse modes and broaden the lasing spectrum. The ultrafast decoherence of laser emission results in the reduction of speckle contrast to 3% in less than 1 ns.

中文翻译：

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使用腔内漫射器快速抑制激光散斑

摘要 快速散斑抑制对于激光照明的时间分辨全场成像至关重要。在这里，我们介绍了一种加速激光发射空间退相干的方法，在纳秒积分时间尺度内实现散斑抑制。该方法依靠将腔内相位扩散器插入简并腔激光器来打破横模的频率简并并加宽激光光谱。激光发射的超快退相干导致在不到 1 ns 的时间内将散斑对比度降低到 3%。