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KrF激光脉冲整形研究 总被引:2,自引:1,他引:2
实验研究了脉冲堆积法对KrF激光的整形能力。利用受激布里渊散射(SBS)压缩脉冲获得了脉宽为3~5 ns的短脉冲,用4束激光堆积获得了脉宽为10~15 ns、平顶宽度为5~10 ns的整形脉冲。利用实测SBS脉冲数据,对脉冲堆积法进行了数值模拟,模拟的脉冲宽度为12.7 ns,平顶宽度为7.7 ns,该结果与实验相符。对脉冲堆积法的任意整形能力进行了模拟,讨论了脉冲宽度变化对整形的影响,发现脉宽变化在5%以内时,对整形脉冲的影响较小。对整形脉冲的放大进行了定性研究,结果表明:平顶脉冲通过放大器后,前沿部分放大较多,由于饱和作用,后沿放大较少;如果前端整形脉冲前沿为斜坡状,放大后可以得到近平顶的脉冲。 相似文献
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Experimental investigation on the improvement of SBS characteristics by purifying the mediums 总被引:2,自引:0,他引:2
The influence of optical breakdown on stimulated Brillouin scattering (SBS) process is investigated with purified CCl4, acetone, and CS2 mediums which are obtained through 0.22-μm pore-size filter. Experiments are conducted with a Nd:YAG Q-switched laser system. The optical breakdown threshold, the reflectivity and the stability of SBS in both purified and unpurified mediums are determined and compared. The improvement of optical breakdown threshold is observed more or less in all purified mediums. In the condition that optical breakdown does not occur after the medium purified, the energy reflectivity and the stability of SBS both show improvement. Therefore, the characteristics of SBS can be improved by purifying the mediums to obtain higher optical breakdown threshold which reduces the influence of optical breakdown on SBS process. 相似文献
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研究了受激布里渊散射振_放双池系统中振荡池和放大池选用不同种类介质的情况.理论分析 结果表明,当两种介质的布里渊频移接近,布里渊线宽有交叉时,系统仍具有放大作用.采 用CCl4作为放大池介质,CCl4/CS2的混合介质作为振荡池介质,利用Nd:YAG调Q 激光研究了布里渊频移的偏离对布里渊放大的影响,结果表明,当布里渊频移的偏离较小时 ,其种子光放大率和种子光脉宽压缩率仍然很大.采用CS2作为放大池介质,苯作为振荡池 介质,对振 放双池系统进行了实验研究,其种子光放大率达到44,种子光脉宽压缩率为 72,相位共轭保真度为98%,种子光放大率的稳定度小于3%.
关键词:
受激布里渊散射
布里渊放大
布里渊频移
布里渊线宽 相似文献
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采用一维瞬态模型对受激布里渊散射(SBS)过程进行了数值模拟,研究了介质参数对SBS特性的影响规律;选取FC-72、FC-75、CCl4、CS2、丙酮、苯以及CCl2/乙醇的混合溶液等作为散射介质,在Nd∶YAG调Q激光系统下进行了实验研究,比较了各种介质所产生的SBS脉宽、能量反射率和波形之间的差异,由此讨论了介质参数对SBS特性的影响。结果表明,介质增益系数越大,吸收系数越小,SBS能量反射率就越大;吸收系数越大,产生的SBS脉宽就越窄;声子寿命越短,SBS波形前沿就越陡,并且越容易出现调制现象。 相似文献
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采用一维瞬态模型对受激布里渊散射(SBS)过程进行了数值模拟,研究了介质参数对SBS特性的影响规律;选取FC-72、FC-75、CCl4、CS2、丙酮、苯以及CCl2/乙醇的混合溶液等作为散射介质,在Nd∶YAG调Q激光系统下进行了实验研究,比较了各种介质所产生的SBS脉宽、能量反射率和波形之间的差异,由此讨论了介质参数对SBS特性的影响。结果表明,介质增益系数越大,吸收系数越小,SBS能量反射率就越大;吸收系数越大,产生的SBS脉宽就越窄;声子寿命越短,SBS波形前沿就越陡,并且越容易出现调制现象。 相似文献
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理论上分析了基于布里渊放大的非共线组束结构中组束效率的影响因素,结果表明,当Stokes种子光和抽运光的夹角限制在90 mrad范围内时,组束效率可以达到80%以上.根据数值模拟的结果,设计了非共线四束激光组束的实验,实现了四束工作频率为10 Hz,能量分别为70.4 mJ,71.3 mJ,78.9 mJ,70.1 mJ的激光组束,组束输出能量为189 mJ.为了进一步简化结构和降低系统损耗,设计了适用于多束激光非共线组束的介质池结构.
关键词:
激光组束
受激布里渊散射
相位共轭
布里渊放大 相似文献
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The influence of optical breakdown on stimulated Brillouin scattering (SBS) process is investigated with purified CCl4, acetone, and CS2 mediums which are obtained through 0.22-μm pore-size filter. Experiments are conducted with a Nd:YAG Q-switched laser system. The optical breakdown threshold, the reflectivity and the stability of SBS in both purified and unpurified mediums are determined and compared. The improvement of optical breakdown threshold is observed more or less in all purified mediums.In the condition that optical breakdown does not occur after the medium purified, the energy reflectivity and the stability of SBS both show improvement. Therefore, the characteristics of SBS can be improved by purifying the mediums to obtain higher optical breakdown threshold which reduces the influence of optical breakdown on SBS process. 相似文献
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