Radiation pressure cools a mechanical oscillator via resolved sidebands
n̄ = ? | Cooperativity C = ? | Cooling factor = ?
Cavity optomechanics: light inside a Fabry-Pérot cavity is coupled to a mechanical oscillator via radiation pressure.
Red-detuned laser (Δ = −Ω_m) drives Stokes scattering to the blue sideband, extracting phonons from the oscillator.
The cooperativity C = 4g²/(κ·γ_m) quantifies the coupling; final phonon number n̄ = n̄_th/(1+C) in the resolved sideband limit κ ≪ Ω_m.
The mechanical spectrum shows the optomechanical spring effect and broadened linewidth A_opt ∝ C·γ_m.