Paraxial-optics Gaussian solution to the Helmholtz equation: waist w_0, Rayleigh range z_R = π w_0²/λ, hyperbolic divergence. Fundamental mode of stable laser cavities.
Paraxial-optics Gaussian solution to the Helmholtz equation: waist w_0, Rayleigh range z_R = π w_0²/λ, hyperbolic divergence. Fundamental mode of stable laser cavities.