线阵激光二极管侧面抽运Nd∶YAG激光器特性研究

依据四能级系统速率方程 ,推导出了多横模振荡固体激光器输出与输入参量的关系。对二极管抽运固体激光器中线阵激光二极管三向对称侧面抽运结构 ,计算了抽运光强分布 ,并就激光器的阈值抽运功率、近阈值条件下的斜率效率、输出功率和光束质量等与抽运参量的关系 ,进行了数值计算。由计算结果看出 ,线阵激光二极管侧面抽运Nd∶YAG激光器中晶体半径和抽运光束腰半径是影响输出激光功率和光束质量的主要因素 ,并通过在谐振腔中加小孔选模 ,使光束质量得到明显改善。选择了一组三向侧面抽运结构参量进行了实验验证 ,实验结果与理论计算一致。

Characteristic of Liner LDs Side-Pumped Nd∶YAG Laser

Starting from the four-level system rate-equations, the relationship between output parameters and pump parameters in multi-mode solid-state laser has been deduced. For a three liner laser diode side-pumped symmetry in laser diode-pumped solid-state lasers, the pump intensity distribution is calculated, and series numerical calculations relating to the relationship between output parameters (such as threshold pump power, slope efficiency, output power and beam performance) and pump parameters are conducted. It can be seen that both radius of Nd∶YAG crystal and of pump beam waist are main factors to affect output power and beam performance. The beam performance has been improved obviously by mode-selecting with a small aperture. A set of parameters in three Liner laser diode side-pumped symmetry have been chosen to test the numerical calculation results experimentally. The experimental results are consistent to calculated ones.