trARPES on Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ using Mid-Infrared Pump

The field of time-resolved ARPES (trARPES) has matured greatly in the last several years and has proven a useful tool in the study of cuprate superconductivity. However, previous experiments have been limited in the pump wavelength to energies of 1.5 eV (or more), far above the relevant energy scales for superconductivity. Here we use an OPA/DFG setup to create a mid-infrared pump, with tunable photon energies from 60-300 meV, allowing us to weakly perturb the superconductivity of optimally doped Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$. Here we report on the k-resolved electron and gap dynamics of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ under this excitation scheme.