Researchers are using non-equilibrium anti-Stokes Raman spectroscopy to investigate Higgs modes in superconductors. Studies have focused on various types of superconductors, including unconventional, cuprate, and iron-based superconductors, with findings on their responses and behaviors. The investigations have employed techniques such as terahertz nonlinear and Raman responses, and quantum control, to characterize and visualize Higgs modes in these materials.