共查询到20条相似文献,搜索用时 31 毫秒
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为了进行大功率TEA CO2 激光器的研究工作,选用大功率旋转火花开关作为功率开关器件,制作了一种由高压谐振充电电路、高抗干扰的开关触发器、大功率旋转火花开关以及倒空式L-C反转电路等组成的脉冲激励电源。在大功率TEA CO2 激光器的实际工作中进行了测试和评估。实际结果表明,我们研制的脉冲激励电源可以满足大功率TEA CO2 激光器的特殊工作要求。其重复工作频率可以在100Hz~400Hz之间任意设定,输出工作电压可达40kV~50kV,电源平均功率大于220kW,电源峰值功率高达1000MW。 相似文献
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Kinetic modeling of a high power fast-axial-flow CO2 laser with computational fluid dynamics method 总被引:1,自引:0,他引:1
A new computational fluid dynamics (CFD) method for the simulation of fast-axial-flow CO2 laser is developed.The model which is solved by CFD software uses a set of dynamic differential equations to describe the dynamic process in one discharge tube.The velocity,temperature,pressure and turbulence energy distributions in discharge passage are presented.There is a good agreement between the theoretical prediction and the experimental results.This result indicates that the parameters of the laser have significant effect on the flow distribution in the discharge passage.It is helpful to optimize the output of high power CO2 laser by mastering its kinetic characteristics. 相似文献
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The implementation of circuits with complex dynamics is a very challenging problem. In this paper we present a new chaotic circuit based on the dynamical equations introduced in IEEE Trans. Circuits Syst., I: Fundam. Theory Appl. 51, 2476-2490 (2004). This circuit has been realized by using programmable analog devices, and, in particular, field programmable analog arrays have been used to implement a two-dimensional 3x3 grid scroll chaotic attractor. The implementation of complex dynamics with low cost circuits is very appealing; moreover, the implementation of the chaotic attractor discussed in this paper is not present in the literature. The experimental results including the synchronization between two chaotic circuits show complete agreement with the simulation results reported in IEEE Trans. Circuits Syst., I: Fundam. Theory Appl. 51, 2476-2490 (2004). 相似文献
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注入锁定TEA CO2激光器激光脉冲特性分析 总被引:1,自引:0,他引:1
本文在一般的TEACO2激光器的动力学方程的基础上,给出注入锁定情况下TEACO2激光器的动力学方程组,并进行数值计算,结果表明,TEACO2激光器注入锁定激光脉冲宽度比自由运转时的变宽了,脉冲峰值功率降低,而且激光脉冲产生的时间提前,这与实验规律相吻合。 相似文献
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This paper reports experimental observations of codimension-two heteroclinic bifurcations in an autonomous third-order electrical circuit. The paper also reports confirmations by computer simulations. In the laboratory experiments, a pair of programmable resistors are used in order to adjust two bifurcation parameters. In the associated two-parameter space, several codimension-one bifurcation sets are experimentally measured to capture codimension-two bifurcation structures. All of these bifurcation sets are numerically confirmed by exact bifurcation equations which are derived from piecewise-linear circuit dynamics. 相似文献
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为了稳定可靠地触发CO2激光器旋转火花开关,设计了一套高压脉冲触发系统并且提出了一种新型的绝缘栅双极晶体管(IGBT)驱动与保护方法。根据CO2激光器中旋转火花开关的触发结构,应用复杂可编程逻辑器件(CPLD)芯片EPM3512开发了可以输出100~500 Hz重频脉冲信号以及单次脉冲信号的触发信号源;应用光耦HCPL-3120设计了具有过流、过压保护功能兼有电磁兼容(EMC)设计的IGBT驱动电路;对高压脉冲变压器进行建模并通过PSPICE软件仿真;搭建了实验平台,进行了联机性能测试。实验结果表明:在500 Hz的重复频率下,高压脉冲触发系统可连续稳定地输出高于38 kV的高压重频脉冲,基本满足CO2激光器的旋转火花开关稳定可靠触发的要求。 相似文献
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介绍了电光采样法测量电子束束团长度的实验原理和装置,理论分析并模拟计算了被测电子束团库仑场分布、ZnTe晶体的电光效应与束团电场的关系,并利用琼斯矩阵法分析了探测光通过电光晶体时在束团电场作用下的偏振变化、测量信号与束团长度的关系等。分析表明:测量中应使束团库仑场垂直于ZnTe的[001]方向,探测光偏振方向与ZnTe晶体y″轴成45°或者135°夹角,1/4波片快轴与探测光偏振方向夹角应取45°,这时平衡探测器输出信号与束团库仑场Eb成正比。1/4波片的作用是将电光晶体的工作点从非线性段移到线性段,平衡探测的作用是简化信号与Eb的关系,并提高信噪比。为实际测量应用提供参考。 相似文献
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直流激励慢速流动陶瓷管CO_2激光器的基模功率较玻璃管激光器高45%。实验结果优于美国J.Macken分布型镀金薄膜对基模CO_2激光器的改善功能。文中还讨论了该激光器大幅度提高功率的机理。 相似文献
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Yu. M. Andreev A. A. Ionin I. O. Kinyaevskii Yu. M. Klimachev A. Yu. Kozlov A. A. Kotkov G. V. Lanskii 《Bulletin of the Lebedev Physics Institute》2010,37(1):11-12
The experimental results of the study of CO laser frequency doubling in ZnGeP2 and GaSe nonlinear crystals of high optical quality are presented. A multifrequency low-pressure Q-switched CO laser and
a selective pulsed electroionization mode-locked CO laser with cryogenic cooling were used in the experiments. The highest
external factor of radiation conversion into the second harmonic of the pulse-periodic Q-switched CO laser and pulsed mode-locked
CO laser was 1% and 3.5%, respectively. Theoretical calculations showed the possibility of obtaining far IR and terahertz
radiation using difference frequency generation of CO laser lines in these crystals. 相似文献
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本文给出了对高功率横流CO_2激光器脉冲预电离过程的理论和实验研究.表明了预电离过程中光电离的重要作用.实验结果表明,脉冲预电离可增大高功率横流CO_2.激光器的pd值(p为放电气压、d为放电间隔),增大放电区注入功率密度.对于提高此类型激光器的放电稳定性和输出激光功率是一种技术简单而有效的手段. 相似文献
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为了满足激光诱导等离子体(LPP)体制下极紫外(EUV)光源对CO2激光器提出的稳定性需求,建立了简化的CO2激光传输系统模型,根据光束稳定性需求对光束功率、指向和位置的监测与控制方法进行了理论和实验研究。根据高功率CO2激光传输系统特点,在实验室内建立了上述光束监测和控制实验系统,包括光束功率控制模块、光束指向控制模块和光束参数监测模块,其中光束参数监测模块可实时测量光束功率、指向、尺寸及发散角等重要参数。仿真与实验结果表明:光束功率控制模块对线偏振激光功率的控制接近1%~100%,光束指向控制模块实现的光束指向稳定度在10μrad以内,可满足CO2激光驱动源的高稳定性要求。 相似文献
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由于自发辐射噪声的涨落,CO2激光器的脉冲峰值强度与时间延迟密切相关。理论和实验研究发现,对于典型的B类CO2激光器.在损耗调制情况下,当脉冲峰值出现在最低腔损耗to之前时,初始自发辐射噪声越大,相对于阈值点的第一个渡跃时间tFP越小,对应的峰值强度越小;当脉冲峰值出现在最低腔损耗to之后时,初始自发辐射噪声越大,相对于阈值点的第一个渡跃时间tFP越小,对应的峰值强度则越大。 相似文献
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由于自发辐射噪声的涨落,CO2激光器的脉冲峰值强度与时间延迟密切相关。理论和实验研究发现,对于典型的B类CO2激光器,在损耗调制情况下,当脉冲峰值出现在最低腔损耗t0之前时,初始自发辐射噪声越大,相对于阈值点的第一个渡跃时间tFP越小,对应的峰值强度越小;当脉冲峰值出现在最低腔损耗t0之后时,初始自发辐射噪声越大,相对于阈值点的第一个渡跃时间tFP越小,对应的峰值强度则越大。 相似文献