论文标题
一项研究通过低温冷却增强CW Ti：蓝宝石激光器的功率的研究
A study of enhancing the power of a CW Ti:sapphire laser by cryogenic cooling
论文作者
论文摘要
在本文中，我们探讨了Ti：蓝宝石激光晶体的低温冷却如何大大降低了透镜，这是两个因素：（i）晶体导热率的增加，（ii）（ii）折射率温度依赖性的降低。我们获得了激光晶体内部泵的热透镜焦距的分析表达，即高斯束。通过分析激光腔稳定性，我们发现，为了使水平和垂直方向的最佳激光腔路径长度之间的相对差异小于0.1％，则热透镜的焦距应长于0.5 m。如果将激光晶体冷却至100 K以下的温度，则可以满足这种要求，而以足以产生100 W输出的功率泵送。因此，很可能通过激光晶体的低温冷却在单个Ti：蓝宝石激光器上实现100 W的输出功率。
In this article, we explore how cryogenic cooling of the Ti:sapphire laser crystal greatly reduces thermal lensing by over an order of magnitude because of two factors: (i) the increase in the thermal conductivity of the crystal, and (ii) the decrease in the temperature dependence of the refractive index. We obtained analytical expression of the focal length of thermal lens for the pump inside the laser crystal being a Gaussian beam. Through analysis of the laser cavity stability, we found that in order for the relative difference between the optimal laser cavity path lengths in the horizontal and vertical directions to be less than 0.1%, the focal length of thermal lens should be longer than 0.5 m. Such a requirement can be met if the laser crystal is cooled to temperatures below 100 K while being pumped at a power that is enough to produce 100 W output. Therefore, it is very likely that an output power of 100 W can be achieved on a single Ti:sapphire laser by cryogenic cooling of the laser crystal.
