排序方式: 共有10条查询结果,搜索用时 31 毫秒
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利用描述CO_2激光器动力学过程的六温度模型理论,建立了计算调Q CO_2激光功率放大器输出特性的数学模型,进行了理论分析和数值计算,并讨论了分光比等参数对输出脉冲特性、输出光谱的影响。结果表明:该调Q CO_2激光功率放大器存在临界增益长度和临界光强分束比,低于临界值时无法获得激光输出;该调Q CO_2激光功率放大器的输出激光脉冲波形、峰值功率、脉冲宽度、输出光谱与光强分束比、抽运电子数密度等参数有关,光强分束比越小,输出的调Q激光脉冲宽度越大,峰值功率越低;该调Q CO_2激光功率放大器利用Q调制的高增益特性,通过控制调Q元件所在的低功率支路可以实现高平均功率的调Q脉冲CO_2激光输出,很好地解决了调Q CO_2激光功率放大器难以高功率运转的问题。 相似文献
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高功率双包层光纤激光器 总被引:5,自引:0,他引:5
介绍了高功率双包层光纤激光器的结构和工作原理,综述这种新型光纤激光器的主要特点及其在国内外的最新进展状况,展望了双包层光纤激光器的应用前景。 相似文献
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Coupling coefficient for TEA CO2 laser propulsion with variable pulse repetition rate 总被引:2,自引:0,他引:2
Because pulse repetition rate affected directly the momentum coupling coefficient of transversely excited atmospheric (TEA) CO2 laser propulsion, a double pulse trigger, controlling high voltage switch of laser excitation circuit, was designed. The pulse interval ranged between 5 and 100 ms. The momentum coupling coefficient for air-breathing mode laser propulsion was studied experimentally. It was found that the momentum coupling coefficient decreased with the pulse repetition rate increasing. 相似文献
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The effects of main laser parameters,such as pulse energy,pulse duration,frequency,and work time on laser propulsion of "air-breathing mode",are investigated experimentally with a high power and high repetition frequency TEA-CO2 pulsed laser.The results show that the momentum coupling coefficient Cm decreases with increasing the pulse energy for single pulse tests and pulse duration of about 1μs.Either higher or lower frequency will reduce Cm in multi-pulse tests,which suggests an optimal frequency for the maximum Cm.As to the work time,the longer the work time is,the less the Cm will be. 相似文献
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红外光电探测器的激光损伤分析 总被引:12,自引:0,他引:12
分析了国内外有关红外光电探测器激光损伤阈值的大量测量数据。讨论了激光损伤探测器的机理以及目前尚未解决的问题。比较了高重复频率脉冲激光和连续波激光对探测器的损伤效果。分析表明 ,在相同平均功率的条件下 ,高重复频率脉冲激光与连续波激光相比 ,探测器损伤效果前者要比后者大得多 相似文献
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设计了触发间隔从100 ms到5 ms可调的双脉冲触发器驱动TEA CO2激光器高压开关,用以模拟激光器不同的输出脉冲重复频率。用该装置精确控制的不同激光脉冲重复频率下,对抛物面型光船模型进行了大气模式激光推进中冲量耦合系数的实验研究。发现冲量耦合系数随着重复频率的增加而下降,而单位时间内光船获得的冲量耦合系数的增量则随着重复频率的增加而增大。初步分析认为,这是由于飞行器内的空气未得到充分的补充造成的。 相似文献
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The effects of main laser parameters, such as pulse energy, pulse duration, frequency, and work time on laser propulsion of "air-breathing mode", are investigated experimentally with a high power and high repetition frequency TEA-CO_2 pulsed laser. The results show that the momentum coupling coefficient C_m decreases with increasing the pulse energy for single pulse tests and pulse duration of about 1 μs. Either higher or lower frequency will reduce C_m in multi-pulse tests, which suggests an optimal frequency for the maximum C_m. As to the work time, the longer the work time is, the less the C_m will be. 相似文献
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