Improvement of terahertz imaging with a dynamic subtraction technique

被引：141

作者：

Jiang, ZP ^{[1
]}

Xu, XG

Zhang, XC

机构：

[1] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA

[2] Rensselaer Polytech Inst, Dept Environm & Energy Engn, Troy, NY 12180 USA

[3] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA

来源：

APPLIED OPTICS | 2000年 / 39卷 / 17期

关键词：

D O I：

10.1364/AO.39.002982

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

By use of dynamic subtraction it is feasible to adopt phase-sensitive detection with a CCD camera to reduce long-term optical background drift. we report on a two-order improvement of the signal-to-noise ratio. The improved system is used to image terahertz field distribution generated by an optically rectified electro-optic crystal with a modulation depth as small as 10(-4). we also introduce a modified detection geometry that realizes near-field imaging capability with greatly improved spatial resolution. (C) 2000 Optical Society of America. OCIS codes: 320.7100, 110.2970, 320.7120, 250.5530.

引用

页码：2982 / 2987

页数：6

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