共查询到19条相似文献,搜索用时 62 毫秒
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介绍了激光布里渊散射探测水下目标的原理,采用基于新型ICCD的布里渊散射激光雷达系统,进行了水下目标探测的相关实验。实验结果表明,激光布里渊散射探测水下目标在探测深度上具有很大优势,同时具有探测隐身目标的能力。 相似文献
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用布里渊散射信号可以探测水下目标.介绍三种基于布里渊散射的水下目标探测方法:F-P扫描干涉仪探测方法、边缘探测方法、F-P标准具-ICCD探测方法,并对这三种方法进行了分析和比较. 相似文献
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光纤布里渊散射光时域反射测量技术(简称BOTDR)是国际上近几年才发展起来的一项尖端技术,应用非常广泛。着重介绍了BOTDR分布式光纤传感技术在煤矿巷道应力监测方面的应用。详细分析了其传感原理和系统应用。该项技术为煤矿巷道应力监测提供了一种全新而可靠的监测方法,可以使我国的煤矿安全生产迈上一个新的台阶,具有非常广阔的应用前景。 相似文献
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水下激光成像系统设计及实验 总被引:2,自引:2,他引:2
针对水下目标探测这一难题,设计了基于距离选通技术的水下激光成像系统并进行了相关实验.从实验结果来看,该系统可有效克服激光后向散射并对水下目标进行成像,对于水下目标探测、识别十分有效. 相似文献
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受激布里渊散射在ICF激光驱动器中的应用 总被引:2,自引:0,他引:2
本文概述了基于受激布里渊散射 (SBS)的位相共轭镜 (PCM )在惯性约束核聚变 (ICF)激光驱动器领域的实际应用 ,着重介绍了在高功率条件下 ,PCM的能量和功率负载强度、位相保真度和波形控制等关键问题。指出在超饱和工作条件下 ,采用SBS放大器—振荡器双池结构的PCM ,在获得高反射率、高保真度、可控脉冲输出的同时 ,不会增加激光系统的不稳定性。 相似文献
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A series of experiments in which the efficiency and fidelity of SBS (stimulated Brillouin scattering) wavefront reconstruction are measured as a function of the temporal coherence, focusing geometry, and power of the laser source is described. The primary motivation of the research is to assess the potential of SBS as the basis of a high-resolution image protection system. Thus, a series of high-resolution image projection experiments using a SBS mirror is also described. It is shown that provided that the coherent length of the laser is longer than the active focal region primarily responsible for the growth of the SBS wave, high SBS reflectivities can be obtained which are independent of the Rayleigh range of the focusing system used. In addition, wavefront reconstruction fidelities having values approaching unity can be observed when using laser powers near the threshold for the SBS process 相似文献
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The gain and reflectivity of the stimulated Brillouin scattering (SBS) process used as a Stokes-wave generator are shown theoretically to be independent of the mode structure of the pump laser provided that the pump-laser mode spacing exceeds the Brillouin linewidth and that the laser coherence length exceeds the characteristic gain length of the SBS process. Under the same set of conditions, the gain of an SBS amplifier is found to depend on the degree of correlation between the laser and Stokes fields. However, due to nonlinear coupling, these two fields become correlated within several characteristic gain lengths, and the subsequent propagation of the two fields is governed by the same set of equations that apply for the case of a single-mode pump laser. These theoretical predictions are tested experimentally for an SBS generator using acetone, carbon disulfide, and methanol as the Brillouin-active media, and the results are in full agreement with the theoretical predictions. 相似文献
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提出了一种将受激布里渊散射(SBS)应用于被动毫 米波综合孔径成像中的方案。运用光纤SBS效应,对毫米波的 抑制载波双边带(DSB-SC)调制信号的一个边带进行放大同时抑制另一个边带,实现毫米波 信号的抑制载波单边带(SSB-SC)调制。将该方案应用 于被动毫米波综合孔径成像中,在获得毫米波信号上变频的同时实现了光学滤波以及单边 带功率放大。深入分析了SBS实现SSB-SC调制的原理以及运用于被动毫米波综 合孔径成像中的可行性。实验结果表明:本文方案可以有效 实现毫米波的上变频、功率放大及滤波功能;与传统电光调制系统相比,本文方案简单有效 ,由于系统对携带毫米波信息的边带有放大作用,可以运用于毫米波功率较低时的成像。 相似文献
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The variation of Brillouin frequency shift with temperature provides a means of remote temperature sensing using an optical fibre both as the sensor and transmission medium. We employ optoelectronic three-wave-mixing on semi-insulating substrates for direct optical signal detection and demodulation. High resolution is expected for short range distributed temperature sensing 相似文献
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Experimental measurements have been made of the stimulated Brillouin backscatter from CCl2 F2 gas in the range of pressures from 1 to 5.75 atm. Using narrow-linewidth KrF laser radiation as the pump backscatter efficiencies of up to 35 percent have been achieved, while at low backscatter efficiencies pulses as short as 1.5 ns in width were obtained. 相似文献
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基于布里渊散射的海洋环境激光遥感技术研究进展 总被引:1,自引:1,他引:0
布里渊激光雷达是探测海洋环境参数的重要手段之一。首先介绍了布里渊激光雷达系统的基本工作原理,然后从理论基础出发,重点介绍了三种依据布里渊散射光谱特征:布里渊频移、布里渊线宽、以及综合二者与海洋环境参数之间的耦合关系建立的反演模型;其次,作为布里渊激光雷达的关键技术,介绍了多种布里渊散射光谱的测量方法:F-P扫描干涉仪探测、边缘探测、F-P标准具- ICCD探测, 以及多边缘探测。 相似文献
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介绍了一种受激布里渊散射(SBS)结合脉冲泵浦的全光纤调Q激光器,获得重复频率可调谐的亚10 ns高功率脉冲.利用瑞利散射(RS)和SBS共同作用自调Q机制,采用光纤干涉环结构与强泵浦抽运,可获得稳定的亚10 ns高功率调Q光脉冲.以脉冲泵浦控制调Q光脉冲产生的重复频率,实现调Q光脉冲输出重复频率的可调谐.实验结果表明:使用3 m高增益掺Er3+光纤,在两只975 nm半导体激光器强泵浦抽运下,可获得脉宽6 ns、峰值功率大于340 W、重复频率0~5 kHz的调Q光脉冲输出.该调Q光纤激光器具有全光纤结构、输出脉冲窄、峰值功率高、重复频率可调谐的特点,可用于分布式光纤传感系统与种子光源. 相似文献