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Selected Papers on Solid State Lasers
SPIE Milestones are collections of seminal papers from the world literature covering important discoveries and developments in optics and photonics.
Investigation of Crystal Imperfections by Means of Laser Light Scattering
The use of light scattering as a method for studying imperfections in crystals is discussed. A unique apparatus using a laser as a light source for ultramicroscopy and angular scattering experiments is described. The results obtained utilizing this apparatus for investigations of imperfections in ruby crystals are presented and discussed. These investigations were done as a function of crystal growth direction, annealing, boule morphology, polarization, chromium concentration, gamma-irradiation, and temperature. The results of this work demonstrate the usefulness of this new equipment as a convenient, nondestructive technique for characterizing imperfections in crystals of relatively large size. They also indicate the existence of both randomly distributed scatterers and oriented scattering regions in ruby crystals and show how these scattering centers are altered by changes in the various parameters studied in this investigation. (Author).
Spectroscopic Considerations of Chromium Doped Lithium Germanate as a Possible Laser Material
Continuous fluorescence, pulsed fluorescence, and excitation measurements were made on lithium germanate samples containing 0. 038, 0. 12, and 0. 18 percent chromium. The several sharp lines appearing in the fluorescence spectrum are attributed to chromium ions in nonequivalent lattice sites. It appears that these sites are filled randomly as chromium concentration is increased. The temperature dependence of the widths, positions, intensites, and lifetimes were investigated for the two most prominent sets of R lines associated with chromium in nonequivalent sites. These results are interpreted in terms of energy transfer between chromium ions in nonequivalent sites, which is efficient enough at high temperatures to allow thermal equilibrium to be established between the two florescent systems but which predicts pumping of the R system by the R' system at low temperatures. (Author).
