共查询到20条相似文献,搜索用时 80 毫秒
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BBO晶体中飞秒脉冲的二次和三次谐波振荡产生 总被引:5,自引:0,他引:5
同时考察了群速色散失配、最低阶群速色散和二阶群速色散。研究了在BBO晶体中飞秒激光脉冲的谐产生,计算了BBO晶体的作为波长函数的晶体的最低阶和二谐群速色散,借助求解改进的耦合波方程的数值计算,得到了飞秒脉冲的二次及三次谐波辐射,分析了最低工阶及二阶GVD对于基波脉冲和谐波脉的影响,最后考虑了三次谐波产生中群速失配的补偿。 相似文献
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单光子探测器日益广泛地应用于科学研究的各个领域,精确地标定其量子效率成为应用的先决条件。我们首次实现了单光子探测器量子效率自绝对标定的原理性实验,即只利用待测探测器本身就可以对其量子效率进行绝对标定,而不需要第二个探测器或任何参考标准。该方法基于自发参量下转换产生的纠缠光子对的时间关联性,在信号光子和闲散光子之间引入延时,由单光子计数率和符合计数率测得探测器的量子效率。 相似文献
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光子晶体光纤及其应用 总被引:2,自引:1,他引:2
光子晶体作为一种新兴的材料 ,将会对整个光子学和光子产业领域产生深远的影响 ,而其最重要的应用之一———光子晶体光纤已经在很多科研技术领域得到了应用 .文章综述了光子晶体光纤的研究进展 ,给出其分类 ,并重点介绍了光子晶体光纤在超短脉冲、光频测量、光纤通信等科研领域的重要应用以及未来的发展前景 相似文献
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Zeng He-ping Wu Guang Wu E. Pan Hai-feng Zhou Chun-yuan F. Treussart J. -F. Roch 《Frontiers of Physics in China》2006,1(1):1-18
Unbreakable secret communication has been a dream from ancient time. It is quantum physics that gives us hope to turn this
wizardly dream into reality. The rapid development of quantum cryptography may put an end to the history of eavesdropping.
This will be largely due to the advanced techniques related to single quanta, especially infrared single photons. In this
paper, we report on our research works on single-photon control for quantum cryptography, ranging from single-photon generation
to single-photon detection and their applications. 相似文献
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A. K. Chaudhary A. M. Rudra P. Kumbhakar G. C. Bhar 《Journal of Applied Spectroscopy》2007,74(4):571-577
We report a technique for the efficient generation of tunable coherent deep UV radiation and its application in studies of
RDX and TNT at the ppm level on the basis of their absorption characteristics. The obtained experimental absorption data are
compared with conventional spectrophotometric data. The UV radiation in the range 200–260 nm has been generated by the type-I
noncollinear third harmonic of the dye laser radiation (600–700 nm) and also by sum frequency mixing (SFM) of Nd:YAG output
(1064 nm) with the second harmonic of the dye laser in β-barium borate (BBO) crystal. The maximum conversion efficiency of
the generated signal is estimated to be 57.5% at λ = 218.9 nm wavelength. Apart from measurements of the absorbance of RDX
and TNT at different concentrations in their respective solutions, the minimum detection concentrations have also been ascertained.
The estimated minimum detectable concentration of RDX is 8.47·10−9 M, whereas that for TNT is 35.7·10−9 M. The data were obtained using only ∼100 μJ/pulse of laser energy.
Published in Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 516–521, July–August, 2007. 相似文献
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采用傅里叶变换的方法将脉冲光分解成不同的频率成分,建立了非单色光抽运的光参量放大耦合方程组的数值求解模型.研究了非单色抽运光对光参量啁啾脉冲放大的小信号增益、大信号增益以及增益带宽的影响.非单色抽运光降低参量放大的增益水平,但同时可提高增益带宽,且抽运光谱宽越宽,对增益带宽的提高作用越大.还进一步从相位失配和参量带宽的角度分析了非单色抽运光使参量放大的增益降低、带宽增大的原因.
关键词:
光参量啁啾脉冲放大
非单色光
增益带宽
飞秒激光 相似文献
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采用预测校正分步傅里叶方法数值模拟了飞秒光脉冲在光子晶体光纤中的非线性传输和超连续谱产生,分析了初始光脉冲的中心波长、峰值功率和光纤长度在光子晶体光纤正、反常色散区对超连续谱形状和带宽的影响。结果表明,当初始光脉冲的中心波长在光纤的反常色散区时,产生的超连续谱宽要远宽于正常色散区,但是光谱的平坦性较差;当光脉冲中心波长在靠近零色散波长的反常色散区且其他脉冲参数不变的情况下,存在一个产生宽且平坦的超连续谱的最佳峰值功率和最佳光纤长度。对于超连续谱系统的优化设计与实际应用具有参考意义。 相似文献
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CHEN Changshui WANG Peilin MING Hai XIE Jianping SHI Dufang SHA Xianwu HE Yulong 《Chinese Journal of Lasers》2000,9(5):400-404
In this paper, a Q-switched intracavity frequency doubling Cr: LiSAF laser is reported. The relation of laser output behaviors with input energy was studied experimentally. The second harmonic output energy of 15.6 mJ at 450.1 nm for pumping energy of 83 J, the second harmonic output energy of 16 mJ at 445.1 nm for pumping energy of 75 J, and a tunable range of 445.1 ~465.1 nm were obtained in experiments. 相似文献
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1 Introduction Themethodsthatcanmeasurethephaseandthe pulsedurationmainlyincludetheFROG[1] (frequency -resolvedopticalgating)andtheSPIDER[2 ] (spectral phaseinterferometryfordirectelectric fieldreconstruction) .FROG[1] usestheunknownpulseitselfasatime delayed ga… 相似文献