4-抛物面镜太赫兹时域传输成像系统的光束轮廓特性

IF 2.5 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2025-07-24 DOI:10.1109/LPT.2025.3592266

Yeganeh Farahi;Andrei Gorodetsky;Miguel Navarro-Cía

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引用次数: 0

摘要

了解太赫兹光谱和成像系统中的光束特性对于准确提取材料特性和良好的图像质量至关重要。利用刀口扫描和针孔扫描，研究了一种基于集成硅透镜光导开关的商用u形4抛物面反射镜传输成像系统。在0.5 ~ 1.2 THz频率范围内，束腰沿平行于e场和h场方向的修正束腰分别为2.4 ~ 1.1 mm和2.3 ~ 1.0 mm，在焦平面处具有极小的不对称性。实验交叉极值始终为-10 dB左右。共焦距离，也称为瑞利范围，对精确光谱成像的最大厚度样品施加限制，实验估计在0.5至1.2太赫兹范围内，沿e平面从11.3 mm到6.9 mm，沿h平面从13 mm到4.6 mm。

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Beam Profile Characterization of a 4-Parabolic-Mirror THz Time-Domain Transmission Imaging System

Knowing the beam properties in THz spectroscopy and imaging systems is paramount for accurate extraction of material properties and good image qualities. Utilizing knife-edge and pinhole scanning, we beam profile a commercial U-shape 4-parabolic-mirror transmission imaging system based on integrated Si lens photoconductive switches. The beam is minimally asymmetric at the focal plane with corrected beam waist along the direction parallel to the E-field and H-field ranging from 2.4 mm to 1.1 mm and from 2.3 mm to 1.0 mm, respectively, in the frequency range 0.5 to 1.2 THz. The experimental cross-polar value is consistently -10 dB approximately. The confocal distance, also known as Rayleigh range, that imposes a limitation in the maximum thickness sample for accurate spectroscopy imaging, is experimentally estimated in the range 0.5 to 1.2 THz to be from 11.3 mm to 6.9 mm along the E-plane, and from 13 mm to 4.6 mm along the H-plane.

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.