We recently predicted [J. Opt. Soc. Am. B 35, 558 (2018) [CrossRef] ] that large radial gradients of the refractive index induced by the pump beam in the heated gain medium of diode-pumped alkali lasers (DPALs) could lead to improved DPAL beam quality. This effect depends on the composition of the buffer gas in the cell. We report here on verifying this counterintuitive finding by careful measurements of the beam quality factor ${M^2}$ in static Cs DPALs with different compositions of the buffer gases.

中文翻译：

---

通过泵浦光束在加热增益介质中引起的折射率梯度来改善DPAL的光束质量：理论预测的实验验证

我们最近预测[J. 选择。Soc。上午。乙35，558（2018）[交叉引用] ]，在二极管泵浦碱激光器（DPALs）的被加热的增益介质诱发泵浦光束的折射率的大的径向梯度可能导致改善的DPAL光束质量。该效果取决于池中缓冲气体的组成。我们在这里报告通过仔细测量具有不同缓冲气体成分的静态Cs DPAL中的光束质量因子$ {M ^ 2} $来验证这一违反直觉的发现。