Speckle patterns result from the interference of multiple reflections in disordered media. This is regarded as a randomization process which destroys information contained within the initial light beam and is deleterious to many optical systems. Indeed, many engineers study speckle to remove its effect. Intriguingly however, the processes that produce the speckle are entirely linear, and there is growing recognition that this complex pattern is rich in useful information on both the incident laser source and the environment, with startling potential uses. We will demonstrate our recent results [1], which show that the speckle pattern produced by light propagation in an integrating sphere can be used as a sensitive wavemeter, with a resolution below 1fm. Moreover, this can be used to stabilize the wavelength of a laser on a timescale and to a stability applicable for laser cooling of cold atoms. Reference: [1] N. K. Metzger, et al., “Harnessing speckle for a sub-femtometre resolved broadband wavemeter and laser stabilization”, Nature Communications 8, 15610 (2017)
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机译：斑点图案是由无序介质中多次反射的干扰引起的。这被认为是随机化过程，该过程破坏了包含在初始光束中的信息并且对许多光学系统有害。实际上，许多工程师都在研究散斑以消除散斑的影响。然而，有趣的是，产生斑点的过程是完全线性的，并且人们日益认识到，这种复杂的图案在入射激光源和环境方面都包含有用的信息，具有惊人的潜在用途。我们将证明我们最近的结果[1]，该结果表明由积分球中的光传播产生的散斑图样可用作灵敏度低于1fm的波长计。此外，这可以用于在时间尺度上稳定激光器的波长，并具有可应用于冷原子的激光器冷却的稳定性。参考：[1] N. K. Metzger等人，“利用散斑解决亚飞米宽带光谱仪和激光稳定问题”，《自然通讯》第8期，第15610页（2017年）
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