强激光与粒子束
2022, 34(11): 111005
1 北京工业大学材料科学与工程学院, 北京 100124
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621999
晶体硅太阳电池具有成本低廉、工艺简单等优点, 但在生产过程中难免会出现断栅、破裂等问题, 因此对太阳电池片的检测至关重要。太赫兹波作为一种具有光子学及电子学特征的电磁波在无损检测方面具有独特的优势。通过采用太赫兹量子级联激光器数字全息成像系统, 对模拟设计的太阳电池金属栅线、破裂硅片以及不同电阻率的衬底进行测试。结果表明, 太赫兹全息成像技术在太阳电池检测领域具有较高的应用价值。
太赫兹 全息成像 太阳电池 terahertz holography solar cells 太赫兹科学与电子信息学报
2019, 17(4): 572
Author Affiliations
Abstract
1 Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
2 Microsystem & Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
3 e-mail: lzy.robin@foxmail.com
We demonstrate high-resolution and high-quality terahertz (THz) in-line digital holography based on the synthetic aperture method. The setup is built on a self-developed THz quantum cascade laser, and a lateral resolution better than 70 μm () is achieved at 4.3 THz. To correct intensity differences between sub-holograms before aperture stitching, a practical algorithm with global optimization is proposed. To address the twin-image problem for in-line holography, a sparsity-based phase retrieval algorithm is applied to perform the high-quality reconstruction. Furthermore, a new autofocusing criterion termed “reconstruction objective function” is introduced to obtain the best in-focus reconstruction distance, so the autofocusing procedure and the reconstruction are unified within the same framework. Both simulation and experiment prove its accuracy and robustness. Note that all the methods proposed here can be applied to other wavebands as well. We demonstrate the success of this THz synthetic aperture in-line holography on biological and semiconductor samples, showing its potential applications in bioimaging and materials analysis.
Photonics Research
2019, 7(12): 12001391
中国工程物理研究院激光聚变研究中心等离子体物理重点实验室, 四川 绵阳 621999
太赫兹量子级联激光器(THz QCL)是一种紧凑、相干的固体连续辐射源,具有重要的潜在应用价值,是当前国际上研究的热点之一。目前,THz QCL面临进一步提高输出功率的问题,而阵列耦合是突破这一瓶颈的有效途径,因此,相关研究就显得尤为重要。概述了THz QCL的现有阵列耦合结构,并总结和讨论了THz QCL阵列研究现状及其未来可能的发展方向。
激光器 量子级联激光器 太赫兹 阵列 波导 激光与光电子学进展
2019, 56(1): 010004