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首页> 美国政府科技报告 >Compact Femtosecond Pulse Approach to Explosives Detection Combining InN-Based Time Domain Terahertz Spectroscopy and Laser-Induced Breakdown Spectroscopy; Final rept. Oct 2006-Sep 2007
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Compact Femtosecond Pulse Approach to Explosives Detection Combining InN-Based Time Domain Terahertz Spectroscopy and Laser-Induced Breakdown Spectroscopy; Final rept. Oct 2006-Sep 2007

机译：紧凑型飞秒脉冲方法结合基于InN的时域太赫兹光谱和激光诱导击穿光谱的爆炸物检测;最终的评论。 2006年10月至2007年9月

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摘要

The feasibility of attaining improved explosives detection and identification using complementary InN-based time-domain terahertz spectroscopy (TDTS) and laser-induced breakdown spectroscopy (LIBS) techniques employing 1550-nm femtosecond (fs) pulse technology has been investigated. The use of very low-energy, ultra-short, near-infrared laser pulses for both TDTS and LIBS has been demonstrated. Novel approaches exploiting polarization fields in wurtzite nitride semiconductors such as InN and GaN led to an enhancement of TMz generation by more than a factor of 3 relative to more conventional sources fabricated from these materials. These results could lead to improved TMz sources at fs fiber laser wavelengths of interest, with further advances in materials quality. Threshold LIBS pulse energies used in this investigation are the lowest reported to date, and gated detection is not required, potentially leading to an overall simpler and inexpensive system more amenable to field use. Finally, the use of low pulse energies in these studies currently available from more compact mode-locked fiber laser systems indicates potential for incorporation in field-deployable explosives-detection platforms.

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