This lecture covers the use of lasers to control atoms and ions, including optical tweezers, ion trapping, and manipulation techniques by Arthur Ashkin, Claude Cohen-Tannoudji, Steven Chu, William D. Phillips, and David J. Wineland. It also discusses the suppression of ion thermal motion, ion trapping using electrodes, and the role of lasers in controlling and measuring trapped ions. Additionally, it explores the quantum mechanics of harmonic oscillators, mechanical resonators, and the advantages of using mechanical oscillators in science and technology. The lecture delves into cavity optomechanics, investigating dissipative ponderomotive effects of electromagnetic radiation, and the theoretical basis for studying mechanical and optical resonators.