Cooperative Effects in Matter and Radiation by J. C. MacGillivray, M. S. Feld (auth.), Charles M. Bowden,

By J. C. MacGillivray, M. S. Feld (auth.), Charles M. Bowden, D. W. Howgate, Hermann R. Robl (eds.)

This quantity comprises the massive majority of the papers offered on the Cooperative results assembly which used to be held as a part of the USA military subsidized Symposium on New Laser innovations at Redstone Arsenal, Alabama, from November 30 via December 2, 1976. the incentive for the assembly used to be to collect a consultant cross-section of study scientists lively in similar parts of cooperative results in matter-radiation box interplay and coherent pulse iteration and propagation. An emphasis used to be put upon the speedily constructing components of superradiance and superf1uorescence, with a stability among thought and test in regard to the alternative of audio system. This assembly got here at a truly lucky time whilst new experimental ends up in steel vapors and gases have only in the near past been learned. additionally represented at the programwereareas facing new laser techniques similar to the unfastened electron laser and photon amplifier. a couple of supplemental papers are incorporated during this quantity which have been authored through contributors on the assembly, yet weren't current at the schedule, essentially because of constrained time. those have been incorporated as a result of their relation to the content material of papers which have been awarded and/or have been the topic of debate between attendees. The assembly consisted of 11 invited papers and paintings­ store periods, each one with a panel. The order of the papers during this quantity often follows the order in their presentation at the schedule. notwithstanding, the supplemental papers were inserted the place appropriate.

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Thus the atomic density n u in state lu> immediately after the passage of the pump pulse is given by7 n u - n (2) g where TQ is the radiative lifetime of the E2 (electric quadrupole) transition; T, A and ¢ are respectively the inverse linewidth, the cross-sectional area, and the number of photons in the pump pulse. Combining Eqs. , assuming the confocal parameter of the pump beam is smaller than the length of the medium), we obtain 3 4TI 2 T2*T --¢n g 1 2 T1T Q aL --AA . 1sltuatlon, · . 1 sec. Thus a L - 2 x 10- 24 "" n.

A) and (b) Synchronized alternate traces showing the cutoff pump pulse and resulting FIR at two pressures. (c) Schematic indicating method of measurement of pulse width and delay. 24 A. T. ROSENBERGER ET AL. 2 Q) I/'J :1.. ~ . -- ,,-- •1 ~ ..... J -- ..... -- .... -@J" ~..... ; 0 ~ .... .... ®-- ... -- .... " 16 20 ®- (b) PULSE WIDTH ... ,. ",,, • 10 Q) I/'J :1.. ;' ®'" Q) ~ (i)/ 0 Figure 5. 08 12 p2 (torr2) Experimental results. 8 W. 2S EXPERIMENTS IN FIR SUPER RADIANCE III. COMPARISON OF RESULTS WITH THEORY The ideal model would give a full quantitative explanation of experimental results, including the effects of the pump, homogeneous and inhomogeneous broadening, propagation and spatially dependent chirping of the emission.

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