中国激光, 2019, 46 (6): 0614036, 网络出版: 2019-06-14
超分辨太赫兹波频谱仪系统 下载: 906次
Super-Resolution Terahertz Wave Spectrometer
摘要
基于光学干涉理论,提出了一种超分辨太赫兹波频谱仪系统。干涉系统采用的是自主研制的宽带氮化镓阵列探测器,用于信号的多点同时探测。所提出的太赫兹波频谱仪具有较高的精度,可实现超分辨。利用阵列探测器得到的二维强度分布,可以测定待测光源的光束质量。利用倍频链发射源产生的470~720 GHz连续太赫兹波对频谱仪进行验证。在75 mm探测距离下,频谱仪的频谱分辨率为100 MHz,测量精度为0.1%,该精度是相同探测距离下分辨极限及精度的20倍。
Abstract
Herein, a super-resolution terahertz wave spectrometer system is proposed based on optical interference theory. The interference system can be used for the multipoint simultaneous detection of signals based on a self-developed broadband GaN array detector. The proposed spectrometer has high precision and can achieve super-resolution. The beam quality of the source to be tested can be measured based on the two-dimensional intensity distribution obtained by the proposed array detector. Continuous terahertz waves, generated by a multiplier-chain emission source with a frequency range from 470 to 720 GHz, are used as the testing source to verify the proposed spectrometer. At a detection distance of 75 mm, the spectral resolution and the measurement accuracy are determined to be 100 MHz and 0.1%, respectively. These values are 20 times the resolution and accuracy limits under the same detection conditions.
魏白光, 袁慧, 赵跃进, 张存林. 超分辨太赫兹波频谱仪系统[J]. 中国激光, 2019, 46(6): 0614036. Baiguang Wei, Hui Yuan, Yuejin Zhao, Cunlin Zhang. Super-Resolution Terahertz Wave Spectrometer[J]. Chinese Journal of Lasers, 2019, 46(6): 0614036.