## Double resonance spectroscopy in gas lasers |

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atomic frequencies cavity length change in laser Chapter coil dc magnetic field decay rate diagonal diffraction loss Doppler double resonance electric field expression flip-coil frequency stabilization system function F gain curve gas laser gauss Hamiltonian He-Ne initial density matrix intensity of laser inversion J-S resonance Johnson noise L-C circuit laboratory representation Lamb dip Lamb theory large collision-broadening Larmor frequency laser cavity laser frequency laser intensity laser oscillation laser power laser transition laser tube Level-Crossing Resonance lineshape linewidth magnetic quantum magnetic sublevels maser matrix elements maximum noise numbers obtained off-diagonal excitation order density matrix oscilloscope phase-sensitive detector population inversion preamp quadrature component resonance effects resonance function result rf field rf frequency rf magnetic rf resonance amplitude rf transitions rotation matrix SD-representation Section shown in Fig signal detection system single-mode laser small collision-broadening spontaneous emission TE^q mode TEqq third order polarization transverse modes velocity voltage width zeroth order density