Laser-cooling Cadmium Bosons and Fermions with Near Ultraviolet Triplet Excitations

Abstract

Cadmium is laser-cooled and trapped with excitations to triplet states with UVA light, first using only the $67$kHz wide $326$nm intercombination line and subsequently, for large loading rates, the $25$MHz wide $361$nm ${}^3{P}_2$$\to$${}^3{D}_3$ transition. Eschewing the hard UV $229$nm ${}^1{S}_0$$\to$${}^1{P}_1$ transition, only small magnetic fields gradients, less than $6$Gcm${}^{-1}$, are required enabling a 100\% transfer of atoms from the $361$nm trap to the $326$nm narrow-line trap. All 8 stable cadmium isotopes are straightforwardly trapped, including two nuclear-spin-$\frac{1}{2}$ fermions that require no additional repumping. We observe evidence of ${}^3{P}_2$ collisions limiting the number of trapped metastable atoms, report isotope shifts for ${}^{111}$Cd and ${}^{113}$Cd of the $326$nm ${}^1{S}_0$$\to$${}^3{P}_1$, $480$nm ${}^3{P}_1$$\to$${}^3{S}_1$, and $361$nm ${}^3{P}_2$$\to$${}^3{D}_3$ transitions, and measure the ${}^{114}$Cd 5s5p${}^3{P}_2$$\to$5s5d${}^3{D}_3$ transition frequency to be $830096573(15)$MHz.

References in corpus (20)

• Tools for quantum simulation with ultracold atoms in optical lattices
• Ultracold Fermi Gases with Emergent SU(N) Symmetry
• Matter-wave Atomic Gradiometer Interferometric Sensor (MAGIS-100)
• Bose-Einstein condensation of alkaline earth atoms: ${}^{40}${Ca}
• Testing gravity with cold atom interferometry: Results and prospects
• Evidence for Nonlinear Isotope Shift in Yb${}^{+}$ Search for New Boson
• Continuous Bose-Einstein condensation
• Improved isotope-shift-based bounds on bosons beyond the Standard Model through measurements of the ${}^2$D${}_{3/2}{-}^2$D${}_{5/2}$ interval in Ca${}^{+}$
• Precision determination of isotope shifts in ytterbium and implications for new physics
• Magneto-optical Trapping of Cadmium
• Observation of non-linearity of generalized King plot in the search for new boson
• Core-Shell Magneto-Optical Trap for Alkaline-Earth-Metal-Like Atoms
• Watt-level blue light for precision spectroscopy, laser cooling and trapping of strontium and cadmium atoms
• Sub-recoil clock-transition laser cooling enabling shallow optical lattice clocks
• Isotope Shifts in Cadmium as a Sensitive Probe for Physics Beyond the Standard Model
• High-resolution isotope-shift spectroscopy of Cd I
• Magneto-optical trapping of mercury at high phase space density
• Clock-line-mediated Sisyphus Cooling
• High-power, frequency-quadrupled UV laser source resonant with the ${}^1$S${}_0$-${}^3$P${}_1$ narrow intercombination transition of cadmium at 326.2 nm
• A many-channel FPGA control system