The construction of a Nd: YAG laser and observation of the output
Chung, Ki Hyun
Cooper, A. W.
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An experimental CW Neodymium-YAG laser has been constructed using a gold coated circular cylindrical pumping cavity. The rod is located along the cylinder axis and is pumped by three tungsten-halide filament lamps symmetrically spaced at equal radial distances from the rod. The resonator consists of a concave 100 percent reflecting mirror and a flat output mirror with variable axial spacing. Lasing threshold was achieved at an input power of 2000 watts with the lamps 12 millimeters from the rod, using a 6.1 percent transmittance output mirror. Threshold was not achieved with* a 27 percent transmittance mirror. A maximum CW output of 2.05 watts was observed with 3300 watts input power. The maximum slope efficiency at the maximum available power of 3300 watts was measured as 0.19 percent, which is considerably lower than found in commercial systems using elliptical cavities. The slope efficiency increased with increase in the input power; this was probably due to the change in the wavelength of the peak emission from the lamps. The optimized output power was greatest at the minimum resonator length of approximately one half the mirror radius of curvature, and reached a minimum at one radius of curvature spacing.
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