“The longer the cavity and the narrower the beam waist, the better the beam quality of the laser emission, or
|\langle x | s \rangle|^2\ = \sum_{j=1}^\N\, \Psi(r_j)^2\ +2 \sum_{j=1}^\N\, \Psi(r_j)\bigg(\sum_{m=j+1}^\N\, \Psi(r_m)cos(\Omega_m-\Omega_j)\bigg) </math”

—  F. J. Duarte

in Pulsed Narrow-Linewidth Tunable Laser Oscillators, [F. J. Duarte, Tunable Laser Optics, Elsevier Academic, 2003, 0-12-222696-8, 147]

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Chilean-American physicist 1954

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