Thulium Fibre Lasers for Quantum Applications

Laser cooling is a necessary tool to generate ultracold atoms in magneto-optical traps (MOT), as atomic transitions can be excited with lasers to address different energy levels. As these transitions differ for each quantum system, flexibility in delivering the right wavelength and power at the atoms is key for viable quantum devices or experiments. In our work, we present custom laser systems at the edges of the thulium emission range for improving barium and strontium atoms trapping experiments [1]. Two of barium's narrow atomic transitions can be directly addressed with lasers at 1762 nm and 2052 nm, while third harmonic generation from 2067 nm and 2095 nm allows to address the red MOT cooling and the clock transitions in strontium at 689 nm and 698 nm.