Takata Y, Nakajima S, Kobayashi J, Ono K, Amano Y, Takahashi Y
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
The Hakubi Center for Advanced Research, Kyoto University, Kyoto 606-8501, Japan.
Rev Sci Instrum. 2019 Aug;90(8):083002. doi: 10.1063/1.5110037.
We developed a laser system for the spectroscopy of the clock transition in ytterbium (Yb) atoms at 578 nm based on an interference-filter stabilized external-cavity diode laser (IFDL) emitting at 1156 nm. Owing to the improved frequency-to-current response of the laser-diode chip and the less sensitivity of the IFDL to mechanical perturbations, we succeeded in stabilizing the frequency to a high-finesse ultra-low-expansion glass cavity with a simple current feedback system. Using this laser system, we performed high-resolution clock spectroscopy of Yb and found that the linewidth of the stabilized laser was less than 320 Hz.
