DENSITY OF HEAT SOURCES AND THE TEMPERATURE IN A CRYSTAL OF AN OPTICAL QUANTUM GENERATOR RUBY (PLOTNOST ISTOCHNIKOV TEPLA I TEMPERATURNOE POLE V KRISTALLE RUBINOVOGO OKG),
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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An analytical investigation of the problem is made using a cylindrical ruby rod with a constant spatial absorption coefficient and a polished surface. An IFP-800 xenon lamp provided isotropic pulsed pumping radiation with an energy of 200 J at 800 v. The diameter of the rod was considered equal to 0.65 cm. It was assumed that only the 0.3 to 0.7-micrometer band of the pumping spectrum was effective. Secondary absorption of the luminescent radiation, the change of the absorption coefficient caused by depopulation of the ground level, and the effect of heating on the yield were neglected. The method of numerical integration of pumping and absorbing spectra was used to compute the heat source densities. These values were then applied for calculation of temperature fields under the assumption that the end faces of the crystal are thermally insulated and its surface has a constant coefficient of heat transfer. Typical cases of pumping by rectangular, instantaneous, and bell-shaped pulses are considered.
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