Laser super-radiant

The nitrogen laser has such a high gain that a laser beam can be obtained even without cavity mirrors tlnough amphfied spontaneous emission (sometimes the term super-radiant laser is used). Normally, a totally reflecting mirror is used at one end of the gain tube while the window at the opposite... 

The trapping of polycyclic aromatic molecules in n-heptane monocrystalline matrices, prepared by slow cooling, leads to oriented molecules inside the paraffinic crystal lattice, and it appears that the trapping sites for coronene, perylene, and pyrene are similar to those observed earlier for quickly frozen solutions of coronene and designated pseudo-liquid sites and substitutional sites .28 From the former studies it seems that aggregation does not play a dominant role. A nitrogen-pumped laser has been used to excite perylene in n-octane at 4.2 in order to investigate non-linear dependence of fluorescence on excitation intensity in a Shpol skii system. The approximately square dependence of one of the vibronic emission lines on the excitation intensity is consistent with super-radiant emission.80... 

Shamrakov D., Reisfeld R. Superradiant laser operation of red Perylimide Dye doped silica-polymethylmethacrylate composite. Chem. Phys. Lett. 1993 213 47-54 Shamrakov D., Reisfeld R. Super radiant film laser operation of perylimide dyes doped silica-polymethylmethacrylate composite. J. Opt. Mater. 1994 4 103-106 Sorek Y., Reisfeld R., Finkelstein I., Ruschin R. Sol-gel glass wave guides prepared at low temperature. Appl. Phys. Lett. 1993 63 3256-3258... 

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