We present a chaotic lidar for underwater ranging and three-dimension (3D) imaging applications. The lidar transmitter based on a laser diode with free space optical feedback is designed to generate 520 nm wavelength wideband chaotic signal. This transmitter is used with a correlation-based lidar receiver to perform a ranging demonstration in clean water with a measured attenuation coefficient of 0.06 m⁻¹ at 520 nm. The experimental results prove that 1.2 cm mean absolute error (MAE) and 3.4 cm range resolution can be achieved and kept in a range of 140 cm at least. Moreover, employing a two-axis mirror for laser scanning, the possibility of the designed chaotic lidar system for 3D imaging is also verified.

中文翻译：

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利用520 nm混沌激光雷达的水下3D成像

我们提出了一种用于水下测距和三维（3D）成像应用的混沌激光雷达。基于具有自由空间光反馈的激光二极管的激光雷达发射器被设计为生成520 nm波长的宽带混沌信号。该发射器使用具有基于相关的激光雷达接收器与0.06微米的测量的衰减系数进行清水测距示范^{- 1}在520nm处。实验结果证明，可以实现1.2 cm的平均绝对误差（MAE）和3.4 cm的范围分辨率，并将其至少保持在140 cm的范围内。此外，采用两轴反射镜进行激光扫描，也验证了设计的用于3D成像的混沌激光雷达系统的可能性。