论文标题
与Hz线宽和$ 10^{-10} $ W POWER相干辅助超级激光激光
Coherence-Assisted Superradiant Laser with Hz Linewidth and $10^{-10}$W Power
论文作者
论文摘要
超级激光基于电基状态之间的时钟过渡$^1 $ s $ _0 $和亚稳态状态$^3 $ p $ _0 $ _0 $ fermionic Alkaline-Earth（-like）原子，已被提议是一种新的有希望的光源，并成为Millihihertz的订单。但是，由于小$^1 $ s $ _0 $ -to- $^3 $ p $ _0 $过渡强度，该系统中的稳态功率相对较低（$ \ sim 10^{ - 12} $ W）。在这项工作中，我们提出了一种基于拉曼过渡引起的耦合的替代超级激光方案10^{-10} $ W（$ \ sim 10^{3} $ photon的稳定泵浦成本。拉曼梁在我们的方案中扮演两个重要角色。首先，由拉曼梁引起的黑暗状态和明亮状态之间的相干性在泵送宽度曲线中产生了新的局部最小值，泵送速率低于$2π\ times 10 $ kHz，这对连续产出非常有利。其次，拉曼梁将长寿$^3 $ p $ _0 $状态混合到激光状态，从而减少线宽。我们的工作大大提高了拉曼过渡引起的连贯性超级激光系统的输出性能，并可能为将来的实际使用提供坚定的基础。
The superradiant laser, based on the clock transition between the electric ground state $^1$S$_0$ and the metastable state $^3$P$_0$ of fermionic alkaline-earth(-like) atoms, has been proposed to be a new promising light source with linewidth being the order of millihertz. However, due to the small $^1$S$_0$-to-$^3$P$_0$ transition strength, the steady-state power in that system is relatively low ($\sim 10^{-12}$W). In this work, we propose an alternative superradiant laser scheme based on a Raman-transition-induced coupling between the $^3$P$_0$ and $^3$P$_1$ states in bosonic alkaline-earth(-like) atoms, and achieve a laser with linewidth $\lesssim 2π\times1$Hz and power $\gtrsim 10^{-10}$W ($\sim 10^{3}$ photons in steady state) at a small pumping cost. The Raman beams play two significant roles in our scheme. First, the coherence between the dark and bright states induced by the Raman beams produce a new local minimum in the pumping-linewidth curve with pumping rate lower than $2π\times 10$kHz, which is beneficial for continuous output. Second, the Raman beams mix the long-lived $^3$P$_0$ state into the lasing state and thus reduce the linewidth. Our work greatly improves the output performance of the superradiant laser system with coherence induced by Raman transitions and may offer a firm foundation for its practical use in future.
