A 6-GW NEODYMIUM GLASS LASER,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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A 6-GW neodymium glass laser with a simple phototropic Q-switch is described. The laser consists of three cylindrical rods in series, each 250 mm long and 45 mm in diameter. Each rod is placed in a multielliptic reflector and is pumped by six direct flashlamps. The external cavity consists of one 99.6-reflective dielectric mirror and a Q-switch placed between the first and second rods. The Q-switch consists of a cell made of two plane-parallel error less than 1 min of arc glass plates joined optically through a 1-cm-thick glass ring. The cell is filled with a polymethine-dye solution to a concentration at which the solution is 99 reflective at 1.06 micrometer. At maximum pumping energies, single 100-120-j, 20-nanosec pulses were obtained. By increasing the pumping energy or by diluting the absorber solution, two or more pulses could be generated. In the case of two-pulse operation 50-80 microsec. repetition frequency, the total output was 200 j. The use of a phototropic liquid switch and large-diameter neodymium glass rods resulted in energy and power densities of 6 jsq cm and 0.3-0.4 Gwsq cm, respectively.
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