共查询到18条相似文献,搜索用时 140 毫秒
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提出并演示了一种基于声光调制器(AOM)主动调Q的环形腔双包层光纤激光器获得窄线宽、窄脉宽和高重复频率激光脉冲的方法。通过在腔内采用以双包层增益光纤作为输入尾纤的泵浦剥离器来缩短腔长,可以降低增益光纤正向放大自发辐射(ASE)的反射,抑制其ASE的增益自饱和效应,使腔内有效增益增大,窄线宽调Q脉冲可在环形腔中快速建立,从而不仅可使调Q脉冲脉宽变窄,还允许其重复频率大幅提升。在7 W泵浦功率下,所提出的调Q光纤激光器获得了线宽和脉宽分别窄至0.16 nm和10.4 ns、重复频率高达150 kHz的调Q激光脉冲。 相似文献
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本文介绍了迴旋管和相对论性器件在苏联的发展趋势和目前达到的水平。文中较详细地介绍了相对论性速调管、切伦柯夫振荡器、偏调管和迴旋管等目前达到的新水平以及它们的应用 相似文献
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基于动量BP神经网络激光陀螺调腔检测方法 总被引:1,自引:0,他引:1
为解决激光陀螺人工调腔质量低、效率不高等缺点,提出一种由CCD相机和光电倍增管构成的多传感器信息融合调腔检测方法,该方法同时检测光斑、光阑中心点及陀螺损耗值,并将这些信息送入融合中心,经过融合计算得到陀螺调腔是否合格的综合判断。融合系统采用动量BP神经网络对多源信息进行融合,根据调腔过程中的输入、输出情况,设计包含输入层、隐含层及输出层的3层网络拓扑结构。实验结果表明,此种方法对激光陀螺调腔质量是否合格判断准确率为93.81%,比人工采用单一传感器分步检测准确率提高了6%。 相似文献
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报道了Cr4+∶YAG晶体作为可饱和吸收体用于包层抽运掺镱光纤激光器被动调Q并得到稳定纳秒脉冲输出。采用环形腔和线形腔两种腔形,可有效抑制受激布里渊散射(SBS)的非线性效应,抑制自脉冲产生,从而得到稳定被动调Q脉冲输出。采用环形腔结构,得到稳定的1μs脉冲输出,时间抖动和振幅抖动均方根(RMS)值小于5%。线形腔中采用高反射率光纤布拉格光栅(FBG)作为输出腔镜,也实现稳定脉冲输出,重复频率9.1~30.3kHz可调谐,最窄脉宽156ns,远远小于国内报道的微秒量级脉冲宽度。虽然平均输出功率只有几百毫瓦,因采用光纤输出,此类脉冲激光器可作为种子源,进而与光纤放大器相匹配,经光纤放大器放大输出功率可达到几十瓦,从而满足实际工业应用需求。 相似文献
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非稳腔-稳腔混合腔失调特性理论研究 总被引:2,自引:0,他引:2
非稳腔-稳腔混合腔的失调特性得到了理论上的研究.当调节混合腔的输出耦合镜几何参数改变时,通过Fox-Li数值迭代法计算其基横模的损耗来研究腔的失调特性.发现混合腔在稳腔方向上不易失调;混合腔的不稳定主要来自于非稳腔方向,且主要来自于输出耦合镜在非稳腔平面内的转动,或者垂直于光轴的平移;偏轴非稳腔要比对称非稳腔稳定.利用混合腔中非稳腔方向易失调的特性,可以设计调Q方案.在正支共焦偏轴非稳腔-稳腔混合腔中应用声光调制器在非稳腔平面内实现声光调Q的可行性,得到了理论的证明. 相似文献
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Secmotron (sector beam deflection modulation tube) is a new kind of high efficient microwave tube which is developed on the
basis of gyrocon, The principle of gyrocon has been analyzed and it manifests that to increase circuit efficiency is necessary
for improving the properties of gyrocon. One of the key points is to increase its perveance. An idea about sector beam is
proposed to reduce the effect of space charge. Also the concept and construction of transforming a column beam to a thin sector
beam are presented. The numerical calculation of some specific structure demonstrates that the above idea is realizable.
This project is supported by NSFC 相似文献
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Secmotron(sector beam deflection modulation tube)is a new kind of high efficientmicrowave tube which is developed on the basis of gyrocon,The principle of gyrocon has beenanalyzed and it manifests that to increase circuit efficiency is necessary for improving the proper-ties of gyrocon.One of the key points is to increase its perveance.An idea about sector beam isproposed to reduce the effect of space charge.Also the concept and construction of transforminga column beam to a thin sector beam are presented.The numerical calculation of some specificstructure demonstrates that the above idea is realizable. 相似文献
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本文利用推广的J-C模型,研究了腔中原子的质心运动对原子自发辐射谱及原子-光场间动量交换的影响,研究结果表明:如果原子具有确定的质心动量,则在环形腔中,原子的质心动量改变原子自发辐射谱的间距,而在驻波腔中,自发辐射谱变成了多峰结构,如果原子的质心动量分布是高斯型的,则原子的质心运动抑制原子的自发辐射,并且该情况下环形腔中的原子自发辐射谱是不对称的,另一方面,原子的质心运动影响它与光场间的动量交换。 相似文献
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《Optical Fiber Technology》2000,6(2):155-163
An erbium-doped fiber ring laser is modeled, using the standard propagation and rate equations of a homogeneous, two-level medium. The numerical model has been obtained by developing a spectral analysis of erbium-doped fiber amplifiers. This approach is modified to account for the cyclical propagation of the field in the ring laser. The numerical simulations provide interesting information on the spectral behavior as well as important characteristics of the cavity, mainly the lasing wavelength and output power. The model also permits the study of competing modes' gain evolution during the transient state of a ring laser cavity, which enables cavity lasing wavelength predictions. To our knowledge, this study is the first of its kind. 相似文献
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