High-power and narrow-linewidth laser light is a vital tool for atomic physics, being used for example in laser cooling and trapping and precision spectroscopy. Here we produce Watt-level laser radiation at 457.75 nm and 460.86 nm of respective relevance for the cooling transitions of cadmium and strontium atoms. This is achieved via the frequency doubling of a kHz-linewidth vertical-external-cavity surface-emitting laser (VECSEL), which is based on a novel gain chip design enabling lasing at > 2 W in the 915-928 nm region. Following an additional doubling stage, spectroscopy of the ¹S₀ → ¹P₁ cadmium transition at 228.87 nm is performed on an atomic beam, with all the transitions from all eight natural isotopes observed in a single continuous sweep of more than 4 GHz in the deep ultraviolet. The absolute value of the transition frequency of ¹¹⁴Cd and the isotope shifts relative to this transition are determined, with values for some of these shifts provided for the first time.

中文翻译：

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用于精密光谱学、激光冷却和锶和镉原子俘获的瓦特级蓝光

高功率和窄线宽激光是原子物理学的重要工具，例如用于激光冷却和俘获以及精密光谱学。在这里，我们在 457.75 nm 和 460.86 nm 处产生瓦特级激光辐射，分别与镉和锶原子的冷却跃迁相关。这是通过 kHz 线宽垂直外腔表面发射激光器 (VECSEL) 的倍频实现的，该激光器基于一种新型增益芯片设计，可在 915-928 nm 区域内以 > 2 W 的功率发射激光。在额外的倍增阶段之后，¹ S ₀ → ¹ P _{1 的}光谱228.87 nm 的镉跃迁是在原子束上进行的，所有八种天然同位素的所有跃迁都是在超过 4 GHz 的深紫外单次连续扫描中观察到的。确定了¹¹⁴ Cd跃迁频率的绝对值以及相对于该跃迁的同位素位移，其中一些位移的值是首次提供。