Potassium tantalate niobate (KTN) crystal-based polarization-modulated 3D ladar with a large field of view.
Potassium tantalate niobate (KTN) crystal-based polarization-modulated 3D ladar with a large field of view.
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DOI：
10.1364/ol.398225
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发表时间：
2020-10
期刊：
影响因子：
3.6
通讯作者：
Yishuo Song;Jiguang Zhao;Bin Wang;Xuping Wang;Bing Liu;Xiaolei Lv;Jianwei Zhang
中科院分区：
文献类型：
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作者：
Yishuo Song;Jiguang Zhao;Bin Wang;Xuping Wang;Bing Liu;Xiaolei Lv;Jianwei Zhang
本文提出了一种利用钽酸铌酸钾（KTN）晶体作为偏振调制器的创新型3D雷达。立方相KTN的光学各向同性可以有效地抑制三维成像中采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极化所需的电压，从而可以使用低噪声的高压放大器来提高测距性能。利用这两个优点，在20°大视场（约0.35 rad）下，15 m处的距离误差为4.8 cm，距离精度为4.4 cm，最大无模糊探测距离为60 m。
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.