Influence of energy level lifetime of Nd:YAG Q-switched laser on laser pulse performance
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摘要:
在对Nd:YAG调Q激光器进行分析和设计时，研究人员通常选择忽略激光下能级寿命对脉冲波形的影响。当激光脉宽远大于激光下能级寿命时，这种近似一般不会带来太大偏差；而当脉宽达到纳秒量级时，Nd:YAG 晶体约30 ns的下能级寿命对脉冲波形的影响会变得非常严重。建立了Nd:YAG下能级寿命对输出脉冲波形影响的理论分析模型，并对窄脉宽的Nd:YAG调Q激光器的输出波形进行仿真研究。研究结果表明，在窄脉宽激光输出情形下，激光下能级寿命会导致调Q脉冲在主峰后出现尾峰，尾峰能量可达主峰能量的一倍以上。同时建立了Nd:YAG声光调Q激光器实验系统，在与仿真计算近似的条件下测量调Q脉冲波形，观察到与仿真结果一致的尾峰现象，实验验证了理论模型的正确性。
Abstract:In the analysis and design of Nd:YAG Q-switched lasers, researchers usually choose to ignore the influence of laser lower level lifetime on pulse waveform. When the laser pulse width is much larger than the laser lower level lifetime, this approximation generally does not bring much deviation. When the pulse width reaches the nanosecond level, the influence of the lower level lifetime of the Nd:YAG crystal about 30 nanoseconds on the pulse waveform will become very serious. The theoretical analysis model of the influence of Nd:YAG lower level lifetime on the output pulse waveform was established, and the output waveform of the narrow pulse width Q-switched Nd:YAG laser was simulated. The results show that in the case of narrow pulse width laser output, the lifetime of the lower energy level of the laser will lead to the tail peak of the Q-switched pulse after the main peak, and the tail peak energy can reach more than 100 % of the main peak energy. At the same time, the experimental system of Nd:YAG acousto-optic Q-switched laser was established. The Q-switched pulse waveform was measured under the condition of approximate simulation calculation, and the tail peak phenomenon consistent with the simulation results was observed. The correctness of the theoretical model was verified by experiments.
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Keywords:
- solid state laser /
- lower level lifetime /
- Nd:YAG
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图 1 仿真计算所用的激光器结构示意图
Figure 1. Schematic diagram of laser structure used in simulation calculation
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图 3 泵浦功率80 W时两种算法仿真结果以及实验对比图
Figure 3. Simulation results and experimental comparison of two algorithms at pump power of 80 W
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图 4 泵浦功率90 W时两种算法仿真结果以及实验对比图
Figure 4. Simulation results and experimental comparison of two algorithms at pump power of 90 W
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图 5 泵浦功率100 W时两种算法仿真结果以及实验对比图
Figure 5. Simulation results and experimental comparison of two algorithms at pump power of 100 W
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