外部光注入的光泵浦自旋垂直腔表面发射激光器中的两个混沌偏振分量对两个复杂形状目标中的多区域精确测距

Precise ranging for the multi regions of two complex-shape targets by using two chaotic polarization components in the optically pumped spin vertical cavity surface emitting laser with optical injection

基于外部光注入的光泵浦自旋垂直腔表面发射激光器(vertical cavity surface-emitting laser,VCSEL)的两个混沌偏振分量,提出了对两个复杂形状目标中的多区域精确测距方案.这里,两个混沌偏振探测波具有飞秒量级快速动态并且被双极性sinc波形调制,使它们具有时空不相关特性.利用这些特性,通过计算多束延时反馈混沌偏振探测波形和与之相对应的参考波形的相关性,实现了对两个复杂形状目标多区域位置矢量精确测量.研究结果表明,对多区域小目标的测距具有非常低的相对误差(低于0.94%).当光电探测器的带宽足够大时,其测距的分辨率达到0.4 mm,并具有很强的抗噪声能力.本文的研究结果在复杂形状目标的精确测距方面具有潜在应用.

The ranging based on the chaotic lidar(CLR)generated by using the nonlinear dynamic of semiconductor with optical feedback or optical injection exhibits many advantages over the ranging using pulse lasers and CW lasers,such as low probability of intercept,strong anti-interference ability and low cost.Moreover,it has high resolution,benefiting from the broad bandwidth of the optical chaos.Finally,it is easily be generated and controlled due to the sensitivity of chaotic radar to laser parameters.The resolution of the correlated chaotic lidar(CLR)ranging which has been reported in many literatures is largely limited by the bandwidth of the chaotic laser.An ultra-fast chaotic laser with large modulation bandwidth is required to further improve the ranging resolution.The recently proposed optically pumped spin-VCSEL has attractive features such as flexible spin control of lasing output,fast dynamics with femtosecond magnitude and large modulation bandwidth.The ultra-fast chaos radar wave emitted from the optically pumped spin-VCSEL with optical injection or optical feedback is expected to be used for improving the resolution and accuracy of target ranging.In addition,since the multi beams of CLRs were utilized in the previous works,the number of ranging targets is limited to a small number of targets.The reported CLR ranging technology cannot completely detect the distance of different regions in the target,and it is not suitable for the accurate ranging of the whole area in the complex shape target.The detection waveform based on the correlation CLR has not been designed before the target ranging,which affects the further improvement of the resolution and accuracy of the target ranging.To overcome these problems,it is necessary to further explore the theoretical and physical mechanism of the CLR ranging for the multi-region in complex shape target,and explore the new scheme and method for its realization.Motivated by these,in this paper,based on the optically pumped spin vertical cavity surface emitting laser with optical injection,we present a novel scheme for the accurate ranging of the multi regions in two complex shape targets,using two chaotic polarization components modulated by the bipolar sinc waveform.Here,these two modulated chaotic polarization probe waveforms possess the attractive features of the uncorrelation in time and space,fast dynamic with femtosecond magnitude.Utilizing these features,the accurate ranging to the position vectors of the multi regions of two complex-shape targets can be achieved by correlating the multi beams of the time-delay reflected chaotic polarization probe waveforms with their corresponding reference waveforms.The further investigations show that the ranging to the multi-region small targets possesses the very low relative error that is less than 0.94%.If the bandwidths of the photodetectors are large enough,their range resolutions are achieved as high as 0.4 mm,and exhibit excellent strong anti-noise performance and strong stability.The multi area target ranging proposed in our scheme has the following attractive advantages:stable and high range resolution,strong anti-noise ability and very low relative error.These characteristics can meet the needs of the position vector ranging of the multi regions in complex shape targets.