Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers
Influence of spherical aberration of the active medium on the performance of Nd:YAG lasers
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DOI：
10.1109/3.247707
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发表时间：
1993-09
影响因子：
2.5
通讯作者：
N. Hodgson;H. Weber
中科院分区：
文献类型：
--
作者：
N. Hodgson;H. Weber
一般来说，由于热导率的温度依赖性和泵浦光分布的不均匀性，Nd:YAG激光棒的温度分布偏离抛物线函数形式。导出了一个解析表达式，它将所得的径向相关折射本领与泵浦光分布的形状联系起来。对于一阶，折光力具有抛物线径向依赖性，并且这种球面像差显着影响激光器的输出特性。通过数值求解菲涅耳积分，从理论上研究了稳定和不稳定谐振器的性能，包括放大率、折光力和棒的像差。当存在像差时，无法同时实现高输出功率和良好的光束质量。两种谐振器类型的实验均使用最大输出平均功率为 320 瓦的脉冲 Nd:YAG 激光器进行。 >
In general, the temperature distribution in Nd:YAG laser rods deviates from a parabolic functional form due to the temperature dependence of thermal conductivity and the inhomogeneity of pumping light distributions. An analytical expression is derived which relates the resulting radially dependent refractive power to the shape of the pumping light distribution. To first order, the refractive power has a parabolic radial dependence and this spherical aberration considerably affects the laser's output characteristics. The performance of both stable and unstable resonators is investigated theoretically by numerically solving the Fresnel-integrals, including the amplification, the refractive power and the aberration of the rod. High output power and good beam quality cannot be achieved simultaneously when aberration is present. Experiments for both resonator types were performed with a pulsed Nd:YAG laser capable of a maximum output of 320 watts of average power. >