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GLASS LASER RESEARCH
CORNING GLASS WORKS NY
This report comprises a series of investigations aimed at the more efficient utilization of neodymium glass lasers. Sections 1 and 2 involve the deterioration under intense light. Damage on the cylindrical surface due to pump light has been shown due to scratches and imbedded particles. This is eliminated by chemical treatment of the surface. The mechanism of solarization is delineated and the problem eliminated by pump light filtering with a minimal 15 per cent loss in output. Sections 3 and 4 involve the improvement of performance by varying external conditions. Sections 5, 6, 7 and 8 involve processes occurring within the laser itself. A detailed investigation to find an accurate value of the gain cross section without assuming degeneracies shows that a straight-forward spectroscopic study can only yield this quantity within a factor of two. Gain measurements in an amplifier are determined for eventual translation, through the gain cross section, into energy storage and real pump efficiency. The final section gives data on the time resolved distortion of a pumped rod to determine the magnitude of this problem in preventing diffraction limited operation. A 15cm rod, under 7000 joule electrical input to the pump light, developed a distortion of several fringes across the aperture.
Semiannual technical rept. for Jul-Dec 1964
See also AD443680.
Approved for public release; distribution is unlimited. Document partially illegible.
Contract Number 2: