Tinsley Jonathan N, Bandarupally Satvika, Penttinen Jussi-Pekka, Manzoor Shamaila, Ranta Sanna, Salvi Leonardo, Guina Mircea, Poli Nicola
Opt Express. 2021 Aug 2;29(16):25462-25476. doi: 10.1364/OE.429898.
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 S → P 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 Cd and the isotope shifts relative to this transition are determined, with values for some of these shifts provided for the first time.
高功率窄线宽激光是原子物理学的重要工具，例如用于激光冷却与俘获以及精密光谱学。在此，我们产生了波长分别为457.75 nm和460.86 nm的瓦级激光辐射，它们分别与镉原子和锶原子的冷却跃迁相关。这是通过对千赫兹线宽的垂直外腔面发射激光器（VECSEL）进行倍频实现的，该激光器基于一种新颖的增益芯片设计，能够在915 - 928 nm波段实现大于2 W的激光输出。经过额外的倍频阶段后，在原子束上对228.87 nm处的镉原子S → P跃迁进行光谱分析，在深紫外波段一次连续扫描超过4 GHz的过程中观测到了所有八种天然同位素的所有跃迁。确定了镉跃迁频率的绝对值以及相对于该跃迁的同位素位移，其中一些位移值是首次给出。
