Song Yishuo, Zhao Jiguang, Wang Bin, Wang Xuping, Liu Bing, Lv Xiaolei, Zhang Jianwei
Opt Lett. 2020 Oct 1;45(19):5319-5322. doi: 10.1364/OL.398225.
An innovative 3D ladar that utilizes potassium tantalate niobate (KTN) crystal as a polarization modulator is proposed in this Letter. The optical isotropy of KTN in cubic phase can effectively suppress the range errors induced by the incident angles of collected beams in 3D imaging. The giant quadratic electro-optic coefficient can dramatically lower the voltage that is required to modulate the polarization so that a high voltage amplifier with less noise can be used to improve the ranging performances. By virtue of these two advantages, a range error of 4.8 cm and a range precision of 4.4 cm at 15 m have been achieved under a large field of view of 20° (about 0.35 rad) and a maximum detection range without ambiguity of 60 m.
本文提出了一种创新的三维激光雷达，它利用铌酸钽钾（KTN）晶体作为偏振调制器。立方相KTN的光学各向同性可以有效抑制三维成像中收集光束入射角引起的距离误差。巨大的二次电光系数可以显著降低调制偏振所需的电压，从而可以使用噪声较小的高压放大器来提高测距性能。凭借这两个优点，在20°（约0.35弧度）的大视场和60 m的无模糊最大探测范围内，实现了15 m处4.8 cm的距离误差和4.4 cm的距离精度。
