Vallet M, Barreaux J, Romanelli M, Pillet G, Thévenin J, Wang L, Brunel M
Institut de Physique de Rennes, Université de Rennes 1-CNRS UMR 6251, Campus de Beaulieu, Rennes, France.
Appl Opt. 2013 Aug 1;52(22):5402-10. doi: 10.1364/AO.52.005402.
An rf-modulated pulse train from a passively Q-switched Nd:YAG laser has been generated using an extra-cavity acousto-optic modulator. The rf modulation reproduces the spectral quality of the local oscillator. It leads to a high pulse-to-pulse phase coherence, i.e., phase memory, over thousands of pulses. The potentialities of this transmitter for lidar-radar are demonstrated by performing Doppler velocimetry on indoor moving targets. The experimental results are in good agreement with a model based on elementary signal processing theory. In particular, we show experimentally and theoretically that lidar-radar is a promising technique that allows discrimination between translation and rotation movements. Being independent of the laser internal dynamics, this scheme can be applied to any Q-switched laser.
利用腔外声光调制器产生了来自被动调Q Nd:YAG激光器的射频调制脉冲序列。射频调制再现了本地振荡器的光谱质量。它在数千个脉冲上实现了高脉冲间相位相干性，即相位记忆。通过对室内移动目标进行多普勒测速，证明了该发射器用于激光雷达的潜力。实验结果与基于基本信号处理理论的模型吻合良好。特别是，我们通过实验和理论证明，激光雷达是一种有前途的技术，能够区分平移和旋转运动。由于该方案与激光内部动力学无关，因此可应用于任何调Q激光器。
