共查询到18条相似文献,搜索用时 78 毫秒
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一种新型固体Q开关——Cr^4+:YAG的实验研究 总被引:4,自引:1,他引:3
对一种适用于Nd^3+:YAG激光系统的新型波动Q开关-掺铬钇铝石榴石(Cr^4+:YAG)进行了实验研究,得到单脉冲量为145mJ,脉宽为30~40ns,效率接近1%,动静比达40%以上的结果。 相似文献
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Cr^4+:YAG被动调Q五激光发态吸收饱和 总被引:1,自引:1,他引:0
运用速率方程计算了R^4+:YAG晶体的基态吸收,激发态吸收与入射脉冲的能量密度和强度的关系。在测量晶体透过率的实验中,发现Cr^4+;YAG晶体的激发态吸收趋于饱和。理论计算与实验数据拟合给出了包括基态吸收截面,激发态吸收截面和寿命等参数。 相似文献
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以Cr4^ :YAG晶体作为可饱和吸收体,氙灯作为抽运源,实现了Cr4^ :YAG晶体在0.946μm波长处的调Q运转。激光脉冲宽度为38ns,能量为1.7mJ。 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^4+:YAG被动调Q微晶片激光器重复频率稳定性研究 总被引:1,自引:0,他引:1
对连续激光二极管抽运Nd:YVO4/Cr4 :YAG被动调Q微晶片激光器输出激光重复频率的稳定性进行了理论和实验研究结果表明,谐振腔内存在最佳净增益,可以使激光器工作在稳定区通过优化腔内的净增益,耦合输出镜反射率为85%,饱和吸收体初始透射率为70%,抽运功率从1.05 W到1.20 W的情况下,激光器工作在稳定区当抽运功率为1.16 W时,获得了重复频率为19.48 kHz,稳定性优于0.68%(RMS)的高重复频率激光输出进一步分析了抽运功率抖动对输出激光重复频率稳定性的影响结果表明,激光器进入稳定区之后,抽运功率的抖动是制约输出激光重复频率稳定性进一步提高的最主要因素针对抽运功率抖动带来的影响,讨论了增益预抽运技术,并比较了其优缺点. 相似文献
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对Cr^4 ,YAG晶体作为1064nm激光的可饱和吸收体进行了研究,利用速率方程,描述了强激光下晶体的激光发态吸收(ESA)的动力学过程。用实验验证了所导出的光强与透过率的理论曲线,并因此论述了可以利用晶体的激发态吸收进行激光调Q,并对其进行优化。 相似文献
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The 946nm diode-pump microchip self-Q-switched laser of a chromium and neodymium codoped yttrium aluminum garnet crystal material (Cr^{4+}Nd^{3+}:YAG) is studied, especially about its physical mechanism of operation. The {}^4F_{3/2}→{}^4I_{9/2} transition of Nd^{3+} ion is beneficial to achieving laser oscillation in a quasi-three-level system based on coating the cavity mirrors of the microchip with films that suppress the 1064nm operation and enhance the 946nm laser. The Cr^{4+} ion is a saturable absorber. The initial loss N_{t1} is high, which acts as the threshold for laser oscillation. The stable loss N_{t2} is low because the Cr^{4+} ion is acceleratively bleached by the fast enhancement of the oscillating laser. The high N_{t1}, small N_{t2} and fast progresses permit the oscillating laser of the Cr^{4+}Nd^{3+}:YAG to have a good self-Q-switched property whose full width at half maximum is about 4.2ns. Its highest laser power is about 5.7mW. Its peak power is about 150W. Its good fundamental transverse TEM_{00} mode results from the absorption bleaching established by both the pump and oscillating lasers, which suppress other transverse mode and allow the oscillation only in the fundamental transverse TEM_{00} mode. 相似文献
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新型Nd^3+:Ca4GdO(BO3)3自倍频晶体Cr^4+:YAG被动调Q激光特性研究 总被引:2,自引:0,他引:2
采用氙灯抽运自倍频晶体Nd^3 :Ga4GdO(BO3)3(简称Nd:GdCOB),Cr^4 :YAG被动调Q,实现了Nd:GdCOB晶体被动调Q激光运转,测量了饱和吸收体Cr^4 :YAG不同小信号透过率小绿激光单脉冲的输出能量、脉冲宽度、重复率,给出了描述Nd:GdCOB晶体调Q工作原理的耦合波方程组,数值求解了该方程组,所得的理论结果与实验值相符合。 相似文献
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Cr4+:YAG crystal was used as a saturable absorber in an active-passive mode-locked Nd:YAG laser. The stable and complete mode-locked pulse train was achieved at 1064 nm. The duration of ~0.8 ns to 2.4 ns for a single pulse was obtained by using Cr4+:YAG crystals with the different initial transmissions, and there was a shortest pulse width. The mode-locking dynamic process of Cr4+:YAG crystal was discussed to explain the experimental result, and the effect of excited-state absorption was considered. 相似文献
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A diode-end-pumped Nd:YAG laser is passively Q-switched by using Cr4+:YAG as saturable absorber. When CW pumped with a laser diode which the maximum power is 550 mW, the laser produces pulses of 24 ns duration at 1064 nm, with an energy of 26 μJ. 相似文献
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Cr^4+:YAG在对撞脉冲锁模的Nd:YAG激光器中实现被动锁模的研究 总被引:8,自引:1,他引:7
在理论上提出了Cr^4+:YAG作为可饱和吸收体在Nd:YAG激光器中实现被动锁模的可能性,运用速率方程组导出在强激光脉冲作用下Cr^4+:YAG激发态吸收的恢复时间和饱和光强。实验上在带有抗共振环结构的接近于介稳腔的脉冲式Nd:YAG激光器中用Cr^4+:YAG作为可饱和吸收体实现被动锁模运转,得到能量13.5mJ、平均脉宽180ps的锁模脉冲序列。 相似文献
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测量了Cr^4+,YAG、Cr^4+,Mg2SiO4晶体在室温和液氮温度下的荧光光谱,吸收光谱和激发态寿命,讨论了温度变化时,两种晶体中Cr^4+近红外辐射积分强度变化与激光发态寿命变化的关系,得出结论:在77K ̄300K范围内,Cr^4+的^3T2能级荧光辐射截面本身受温度影响不大,Cr^4+辐射荧光的变化,主要是由无辐射弛豫速率随温度变化而引起的。 相似文献
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WAN Xiaoke LIN Lihuang OUYANG Bin DING Yanhua XU Jun DENG Peizhen 《Chinese Journal of Lasers》1997,6(3):193-197
SaturableExcitedStateAbsorptionofCr4+YAGforQ┐switchingNdYAGLaserWANXiaokeLINLihuangOUYANGBinDINGYanhuaXUJunDENGPeizhen(Shang... 相似文献