Optical Control of ⁸⁸Sr⁺ Ion with a Fully Integrated Photonic Laser

Advances in integrated photonics and on-chip ion trap fabrication are promising for realizing compact transportable trapped-ion optical clocks. We demonstrate optical control of the ²D_5/2 to ²P_3/2 transition at 1033 nm of a ⁸⁸Sr⁺ ion with a frequency stabilized vernier ring laser. The laser has an intrinsic linewidth of below 1 MHz and a ~1 mm²  footprint. This laser is used to quench the long lived clock state both when operating an optical clock and when cooling a motional mode of the ion to a mean phonon occupation number of less than one. To benchmark the spectral performance of the laser, we performed spectroscopy on the ²D_5/2 to ²P_3/2 transition. This technology is promising for realizing a two IR wavelength clock with ²²⁵Ra⁺,  as this platform is suitable for generating both of these wavelengths,1079 nm and 828 nm.