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采用数值计算的方法,对脉冲激光二极管三向侧面抽运固体激光器中,激光晶体的温度场时变分布进行了计算.分析了三向侧面抽运情况下晶体内光强分布,在此基础上,采用有限元法,以脉冲激光二极管侧面抽运Nd∶YAG激光器为例,对单脉冲过程中晶体温度分布及其影响因素进行分析.结果表明,晶体升温过程受到抽运条件以及散热条件的影响,但是主要受到抽运条件即抽运光强度和光束半径的影响,降温过程受到晶体热物性参数和晶体半径以及散热条件的影响.当晶体温度达到周期性分布后,由于晶体径向温度梯度的周期性变化,引起通过晶体的平面光波的中心和边缘光线相对光程差也随时间作周期性变化.
The time-dependent temperature distribution of the laser crystal in a pulsed laser diode with a three-way side-pumped solid-state laser is calculated numerically, and the distribution of the light intensity in the crystal with the three-way side-pumped is analyzed , The finite element method was used to analyze the crystal temperature distribution and its influencing factors during the single pulse by using a laser diode pumped side-pumped Nd:YAG laser as an example.The results show that the crystal heating process is affected by pumping conditions and cooling conditions , But it is mainly affected by pumping conditions, ie, pumping light intensity and beam radius, and the cooling process is affected by the physical properties of the crystal and the crystal radius as well as the heat dissipation conditions.When the crystal temperature reaches a periodic distribution, due to the crystal radial temperature gradient Periodic changes that cause the relative optical path length difference of the center and edge rays of the plane light waves that pass through the crystal to also periodically change over time.