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本文从描述饱和吸收体调Q的速率方程出发,推导实现有激发态吸收的饱和吸收体调Q所需的反围粒子数理论上应满足的条件,并对其进行讨论分析。 相似文献
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含Cr离子饱和吸收体被动调Q解析解 总被引:11,自引:3,他引:8
讨论了慢恢复饱和吸收体的被动调Q过程,在合理简化被动调Q速率方程组的基础上,得到了能反映激发态吸收效应的慢恢复饱和吸收体被动调Q的判据,以及调Q脉冲的峰值功率,脉冲能量,脉冲宽度和能量利用率等调Q重要参量的解析表达式,结果具有一定的普遍性,有助于这类被动调Q激光器的优化设计。 相似文献
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Cr^4+:YAG的可饱和吸收特性与被动Q开关性能研究 总被引:22,自引:6,他引:16
运用速率方程计算了Cr^4+:YAG晶体的可饱和吸收特性参数,包括初始吸收系数,饱和吸收系数,饱和光强和损耗调制度,用Cr^4+:YAG对脉冲和连续Nd:YAG激光器进行了被动调Q,在脉冲Nd:YAG激光器上得到了8ns的调Q激光脉冲,在连续Nd:YAG激光器的调Q中得到了间隔和幅度抖动小于5%的输出脉冲充列。 相似文献
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Cr,Ca:YAG的液相外延生长 总被引:2,自引:0,他引:2
报道了可饱和吸收体Cr^4 :YAG的液相外延生长,对双掺杂Cr,Ca:YAG外延层的吸收特性进行了分析。通过对Cr离子掺杂浓度以及外延层厚度的控制,λ=1.064μm的饱和与非饱和透过度差△T可以在5%-30%的范围内进行调节,满足单片式被动调Q微晶片激光器对饱和吸收体的设计要求。分析结果同时表明外延Cr,Ca:YAG层中还有Cr^5 离子的存在。 相似文献
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采用数值求解被动调Q速率方程,并讨论了基于热键合技术被动调Q激光器的优化方法。通过数值仿真讨论分析了谐振腔的损耗、饱和吸收体的初始透过率、输出镜的反射率和泵浦功率等参数对激光输出的影响。结果表明:输出镜存在最佳透过率,使得输出功率最高和脉冲能量最大;减小饱和吸收体的初始透过率能有效提高脉冲能量,并压缩脉宽,但是会增加阈值泵浦功率;泵浦功率与脉冲重复率和输出功率近似成线性增加,增大泵浦功率可以压缩脉宽。并通过实验验证了理论分析的正确性。 相似文献
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《光学学报》2010,(3)
采用激光二极管(LD)抽运c轴切割的Nd:GdVO_4晶体,声光调制器作为主动调Q开关,Cr~(4+):YAG饱和吸收体作为被动调Q开关,实现了声光Cr~(4+):YAG主被动双调Q 1.06μm激光运转。实验结果表明,通过改变声光调制器和Cr~(4+):YAG饱和吸收体在谐振腔内的位置,可以有效地控制脉冲宽度,同时获得了双调Q激光的单脉冲能量、峰值功率的变化范围。根据ABCD矩阵传输理论计算得出的腔内模式半径沿腔轴的变化关系,考虑腔内振荡光强的空间高斯分布以及声光调制的渡越时间,给出了LD抽运声光Cr~(4+):YAG主被动双调Q激光的耦合速率方程组,理论计算与实验结果相符。 相似文献
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A compact high-power yellow pulsed laser has been demonstrated by use of intracavity sum-frequency mixing in a diode-end-pumped Q -switched Nd:YVO(4) dual-wavelength laser. A three-mirror configuration forming two separate laser cavities is used to optimize the gain match for simultaneous dual-wavelength emission in Q -switched operation. Under the optimum cavity-length condition, the highest yellow average power is 340 mW and the peak power is 2 kW, obtained at 12.5 W of pump power. 相似文献
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An analytical expression for the difference in buildup time between two longitudinal modes in a passively Q -switched laser resonator is developed and compared with experimental laser data. The results support the following temporal criterion for single-frequency, passively Q -switched operation: The difference in buildup time between any two longitudinal modes of the laser resonator should be comparable with or greater than the laser pulse duration to ensure single-frequency operation. 相似文献
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利用可饱和吸收半导体GaAs作为被动调Q元件和FP输出耦合镜,实现了半导体激光器(LD)抽运Nd:YVO4激光调Q运转,获得脉宽度为47ns,重复频率为1183kHz,平均功率为430mW,光束质量为M2=113的TEM00激光基横模输出,调Q抽运阈值为1700mW.并数值求解了含有GaAs被动调Q兼输出耦合的速率方程,分析了GaAs被动调Q机理以及脉宽宽度、重复频率、平均功率随抽运速率、腔长的变化关系,理论与实验结果相一致.为多功能综合型微型调Q固体激光器提供了简单有效的方法.
关键词:
被动调Q
输出耦合
GaAs 相似文献
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Self-Q-switched diode-end-pumped Nd:BGO laser¥HUWentao;ZHOUFuzheng;FANDianyuan;JIANGZhonghong(ShanghaiinstitufeofOpticsandFin... 相似文献
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R. Marchetti E. Penco A. Perito M. Tomassini A. Tranquilli 《Optics Communications》1979,29(3):347-352
This paper presents the experimental results of a study on the thermal effects due to pulsed optical pumping in ED2 Nd glass rods, cladded with samarium glass, and in Q88 Nd phosphate glass laser rods. A pseudo-elliptic close-coupled pumping cavity, very efficient and simple to be made has been used; this entails two types of rod deformations which in turn are responsible of two optical effects: a focusing effect and a prismatic effect. The time evolution of these effects under single shot condition and at low repetition rate (1 pulse every 5 s) is described. At single shot the behaviour is opposite to that previously reported in the literature. 相似文献