Cr^(4+):YAG被动调Q激光器中受激粒子上转换效应对脉冲的影响研究

Influence of energy-transfer upconversion effect on the pulse in diode-pumped Cr:YAG passively Q-switched lasers

分析和报道了受激粒子能量上转换 (ETU)效应对Cr:YAG被动调QNd :YAG Nd :YVO4激光器的输出脉冲影响研究 .结合ETU理论分析和被动调Q速率方程组 ,得到了初始反转粒子密度 ,末态反转粒子密度和光强最大时反转粒子密度的比值变化对激光输出脉冲宽度和脉冲能量的影响 ,和实验结果相一致 .同时讨论了降低ETU效应的方法 。

Influence of energy-transfer upconversion (ETU) effect on the output pulse in diode-pumped Cr: YAG passively Q-switched lasers is investigated. Using the ETU theory and Q-switching rate equations, the initial population inversion, the final population inversion and the threshold population inversion at the maximum photon density are achieved. The output pulse width and pulse energy depend on the relation between them. The predicted results are in good agreement with the experimental results. The method of reducing the ETU effect is also discussed and it is useful to optimize this kind of lasers.