首页> 外文会议>Conference on Chemical and Biological Sensing V; 20040412-20040413; Orlando,FL; US >Remote atmospheric breakdown for standoff detection using intense short laser pulse compression
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Remote atmospheric breakdown for standoff detection using intense short laser pulse compression

机译:使用强烈的短激光脉冲压缩进行远距离大气击穿以检测对峙

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A remote atmospheric breakdown (RAB) is a very rich source of ultraviolet (UV) and broadband visible light that could provide the early warning to the presence of CW/BW agents through spectroscopic detection, identification and quantification at extended standoff distances. A low-intensity negatively chirped laser pulse propagating in air compresses in time due to linear group velocity dispersion and focuses transversely due to non-linear effects resulting in rapid laser intensity increase and ionization near the focal region that can be located kilometers away from the laser system. Proof of principle laboratory experiments are being performed at the Naval Research Laboratory on the generation of RAB and the spectroscopic detection of mock BW agents. We have demonstrated pulse compression and focusing up to 105 meters in the laboratory using femtosecond pulses generated by a high power Ti:Sapphire laser. We observed nonlinear modifications to the temporal frequency chirp of the laser pulse and their effects on the laser compression and the positions of the final focus. We have generated third harmonics at 267 nm and white light in air from the compressed pulse. We have observed fluorescence emission from albumin aerosols as they were illuminated by the compressed femtosecond laser pulse.
机译:远距离大气击穿(RAB)是紫外线(UV)和宽带可见光的非常丰富的来源,可以通过在远距离对峙距离处进行光谱检测,识别和定量来对CW / BW药剂的存在提供预警。在空气中传播的低强度负chi激光脉冲会由于线性群速度色散而及时压缩,并由于非线性效应而横向聚焦,从而导致激光强度快速增加并在离激光器几公里的焦点区域附近电离系统。海军研究实验室正在对RAB的生成和模拟BW试剂的光谱检测进行原理实验室实验的证明。我们已经演示了使用高功率Ti:Sapphire激光器产生的飞秒脉冲在实验室中进行脉冲压缩并聚焦到105米处。我们观察到了对激光脉冲的瞬时频率chi的非线性修改,以及它们对激光压缩和最终焦点位置的影响。我们在267 nm处产生了三次谐波,并从压缩脉冲中在空气中产生了白光。我们已经观察到白蛋白气溶胶的荧光发射,因为它们被压缩的飞秒激光脉冲照亮。

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