A solar laser pumping approach to achieve both simultaneous and stable multibeam solar laser operation under solar tracking error condition is proposed here. By using a heliostat, solar radiation is firstly redirected to a parabolic mirror, secondarily concentrated by an aspheric lens, and finally absorbed by four Nd:YAG rods within a pump cavity using a homogenizer. Zemax® and LASCAD™ analysis demonstrate that four simultaneous and stable 1064-nm continuous-wave solar laser emissions with similar multimode power levels can be achieved even with azimuthal solar tracking errors up to ± 0.5 deg. The variation on the multimode solar laser power of the four rods is significantly reduced from 32.38% and 55.52% without the homogenizer to 0.00% and 0.21% with the homogenizer for ± 0.1 deg and ± 0.2 deg azimuthal solar tracking error, respectively. More importantly, simultaneous and stable TEM00 mode solar laser emissions from the four rods are also numerically attained under solar tracking error condition.

中文翻译：

---

用于在跟踪误差条件下同时和稳定多光束操作的太阳激光泵浦方法

此处提出了一种在太阳跟踪误差条件下实现同时且稳定的多光束太阳激光器运行的太阳激光泵浦方法。通过使用定日镜，太阳辐射首先被重定向到抛物面镜，其次被非球面透镜聚集，最后被泵腔内的四个 Nd:YAG 棒使用均化器吸收。Zemax® 和 LASCAD™ 分析表明，即使方位角太阳跟踪误差高达 ± 0.5 度，也可以实现具有相似多模功率水平的四个同时且稳定的 1064 nm 连续波太阳激光发射。对于 ± 0.1 度和 ± 0.2 度方位角太阳跟踪误差，四个棒的多模太阳能激光功率的变化从没有均化器的 32.38% 和 55.52% 显着降低到使用均化器的 0.00% 和 0.21%。