“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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F. J. Duarte11

Chilean-American physicist 1954

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“Regardless of the prophetic value of Dirac’s description [on interference] his was probably the first discussion… including a coherent beam of light. In other words, Dirac wrote the first chapter in laser optics.”

F. J. Duarte (1954) Chilean-American physicist

in Introduction to Lasers, [F. J. Duarte, Tunable Laser Optics, Elsevier Academic, 2003, 0-12-222696-8, 3]

“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”

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F. J. Duarte11

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“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”