STTR PHASE I: Electro-Optic Field Sensors for Far-Infrared Imaging Applications

STTR 第一阶段：用于远红外成像应用的电光场传感器

• 批准号: 9632181
• 负责人: Kevin Stewart
• 金额: $ 9.99万
• 依托单位: Molecular OptoElectronics Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632181&HistoricalAwards=false
• 关键词: STTR; PHASE; Electro; Optic; Field

*** 9632181 Stewart We propose to investigate and develop an imaging system based on ultra-wideband electric-field sensors. The proposed device will be based on a new optoelectronic design which is capable of timedomain far-infrared spectroscopy across a frequency range extending from near DC to several THz. Fundamentally, the electric-field sensor system is based on the linear electro-optic effect (Pockel's effect) in electro-optic crystals where a pulsed microwave signal acts as a transient bias to induce a transient polarization in the sensor crystal. This polarization is then probed by a synchronously pulsed laser beam, and the spatial and temporal electric-field distribution is projected onto a CCD camera by the laser. Our previous studies of these imaging sensors has demonstrated a sub-wavelength spatial resolution, femtosecond temporal resolution, near DC-THz bandwidth, sub-mV/cm field sensitivity, up to 100 Hz scan rate, and a signal-to-noise ratio better than 10,000:1. The electro-optic detection has a flat (nonresonant) spectral responsivity (from near DC to several THz), a large detector area ( 1 cm2), and an extended dynamic range ( 1,000,000). The simplicity of the detection geometry, capability for optical parallel processing, and excellent signal-to-noise ratio make this system suitable for real-time, 2-D coherent far infrared imaging applications. ***

* 9632181斯图尔特 我们提出研究和开发一种基于超宽带电场传感器的成像系统。拟议的设备将基于一种新的光电设计，该设计能够在从近DC到几个THz的频率范围内进行时域远红外光谱分析。基本上，电场传感器系统基于电光晶体中的线性电光效应（Pockel效应），其中脉冲微波信号充当瞬态偏置以在传感器晶体中引起瞬态极化。然后，通过同步脉冲激光束探测该偏振，并且通过激光将空间和时间电场分布投影到CCD相机上。我们之前对这些成像传感器的研究已经证明了亚波长空间分辨率，飞秒时间分辨率，近DC-THz带宽，亚mV/cm场灵敏度，高达100 Hz的扫描速率，以及优于10，000：1的信噪比。电光检测具有平坦（非共振）光谱响应度（从近DC到几个THz）、大检测器面积（1 cm 2）和扩展的动态范围（1，000，000）。简单的检测几何结构，光学并行处理的能力，和优良的信噪比，使该系统适合于实时，2-D相干远红外成像应用。 ***