Spectroscopic Evaluation of Materials.
Final rept. 1 Jan 68-31 Dec 70,
SANDERS ASSOCIATES INC NASHUA N H ELECTRO-OPTICS DIV
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The report is divided into two parts. In Part I a non-destructive testing technique is described for the evaluation of damage in ruby laser rods using electron spin resonance. The technique permits examination of ruby rods with conventional ESR techniques without the use of a resonant microwave cavity. Severely damaged rods have been examined with this technique and have conducted controlled damage studies in SIQ rubies before and after comparisons are made. In addition, the range of power densities resulting in measurable damage in the rods are defined. Passively laser irradiated ruby samples were also studied using the conventional ESR technique for comparison purposes. In Part II the results of attempts to improve the pumping efficiency of Nd and Er glass laser rods using the diffuse reflectance and fluorescent properties of Cr3 doped flame fusion spinel powders are discussed. In addition, the results of detailed spectroscopic studies of the optical properties of flame fusion spinel are discussed. Evidence for the formation of a second site in off stoichiometric MgOAl2O3 is presented. Author
- Lasers and Masers