SBIR Phase I: A Novel Coherent and Tunable Terahertz (THz) Module for Chemical Identification

SBIR 第一阶段：用于化学识别的新型相干和可调谐太赫兹 (THz) 模块

• 批准号: 0211501
• 负责人: Wei Shi
• 金额: $ 10万
• 依托单位: DING, YUJIE J.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0211501&HistoricalAwards=false
• 关键词: SBIR; Phase; Novel; Coherent; Tunable

This Small Business Innovation Research (SBIR) Phase I project focuses on the implementation of a Terahertz (THz) module that can emit coherent and tunable Terahertz waves. This project naturally follows the recent result obtained by the Project Investigator. Recently, coherent Terahertz radiation was generated at room temperature, which could be continuously tunable from 56.8 mm to beyond 1618 mm (5.27 to 0.18 THz), in Gallium Selenide, based on difference-frequency generation. The peak Terahertz power can be as high as 69.4 W at 196 mm. The corresponding photon conversion efficiency reaches 3.3%. This value has been greatly improved owing to the combination of extremely low absorption coefficients in the Terahertz domain and a large second-order nonlinear coefficient for Gallium Selenide. On the other hand, it has been demonstrated that optical parametric oscillator in Lithium Niobate can be used to generate a Terahertz wave tunable in the range of 110-460 m (2.7-0.7 THz) with a peak power of 300 W. However, Lithium Niobate suffers from photorefractive damage. One needs a much higher laser intensity to achieve parametric oscillation. The Terahertz source will dramatically impact molecular spectroscopy. Such an instrument can be eventually used to control pollution and to identify toxic chemicals, for remote sensing, bio- medical imaging, and security screening.

这个小企业创新研究（SBIR）第一阶段项目的重点是实现一个太赫兹（THz）模块，可以发射相干和可调谐的太赫兹波。本项目自然遵循项目调查员最近获得的结果。最近，相干太赫兹辐射产生在室温下，它可以连续调谐从56.8毫米到超过1618毫米（5.27至0.18太赫兹），在硒化镓，基于差频产生。在196 mm处的太赫兹峰值功率可达69.4 W，相应的光子转换效率达到3.3%。由于硒化镓的太赫兹域中极低的吸收系数和大的二阶非线性系数的组合，该值已大大提高。另一方面，已经证明铌酸锂中的光学参量振荡器可以用于产生峰值功率为300 W的在110-460 m（2.7-0.7 THz）范围内可调谐的太赫兹波。然而，铌酸锂遭受光折变损伤。需要更高的激光强度来实现参量振荡。太赫兹源将极大地影响分子光谱学。这种仪器最终可用于控制污染和识别有毒化学品，用于遥感、生物医学成像和安全检查。