We analyzed bichromatic and polychromatic stimulated forces for laser cooling and trapping of Yb atoms using only the narrow ${}^1{S}_0\to {}^3{P}_1$ transition. Our model is based on numerical solutions of optical Bloch equations for two-level atoms driven by multiple time-dependent fields combined with Monte Carlo simulations, which account for realistic experimental conditions such as atomic beam divergence, geometry, and Gaussian laser modes. Using 1 W of laser power, we predict a loading rate of $\approx {10}^8$ atoms/s into a 556-nm magneto-optical trap (MOT) with a slowing force of $\approx 60F_{\text{rad}}$. We show that a square-wave modulation can produce similar stimulated forces with almost twice the velocity range and improve the MOT loading rate of Yb atoms by up to 70%.

中文翻译：

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Yb 原子在窄 1S0→3P1 跃迁上的受激减速

我们分析了双色和多色受激力的激光冷却和 Yb 原子的俘获仅使用窄 ${}^1{秒}_0\to {}^3{磷}_1$过渡。我们的模型基于由多个瞬态场驱动的两级原子的光学布洛赫方程的数值解，并结合蒙特卡罗模拟，考虑了真实的实验条件，如原子束发散、几何和高斯激光模式。使用 1 W 的激光功率，我们预测加载速率为$\approx {10}^8$ 原子/秒进入 556 nm 磁光阱 (MOT)，减速力为 $\approx 60F_{\text{弧度}}$. 我们表明方波调制可以以几乎两倍的速度范围产生类似的受激力，并将 Yb 原子的 MOT 加载率提高多达 70%。