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### Contents

Introduction | 1 |

Molecular Microwave Oscillator and New Hyperfine Structure in the Microwave Spectrum of NH3f J P Gordon H | 22 |

Saturation of the Electron Spin Resonance A M Portis | 35 |

Copyright | |

24 other sections not shown

### Common terms and phrases

active medium amplifier amplitude Appl approximation assumed atomic beam behavior broadening calculated cavity cavity resonance coefficients coherent condition confocal consider constant corresponding coupling crystal decay density matrix detuning diffraction losses dipole distribution Doppler effect electric field emitted energy equations of motion excited factor FM oscillation free-running frequency function gain Gaussian given He-Ne IEEE integral intensity interaction interferometer Lett levels linear linewidth magnetic maser maser oscillator Mc/sec microwave mirrors mode-locked mode-locked laser modulation molecular molecules noise noise figure nonlinear obtained operator optical maser optical resonator parameters parametric oscillation peak perturbation phase shift photon Phys plane polarization population inversion pulse pulsewidth pump quantum electrodynamics Quantum Electron quantum mechanics radiation field resonator ruby saturation semiclassical semiclassical theory shown in Fig signal solution spin spontaneous emission steady-state stimulated emission temperature thermal threshold tion transition transverse modes velocity wave width zero