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Geometrical transformation of linear diode-laser arrays for longitudinal pumping of solid-state lasers

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2 Author(s)
Leger, J.R. ; Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA ; Goltsos, W.C.

A 200-stripe linear diode-laser array is geometrically transformed into a two-dimensional, symmetric virtual source with symmetric divergence to end pump a Nd:YAG laser. The geometrical transformation is performed by two planes of diffractive optical elements separated by a 2.6-cm gap. Discounting optical losses, a TEM00 mode slope efficiency of 56% is demonstrated. Methods of increasing the throughput efficiency of the diffractive elements (currently approximately 50% per element,) are explored. A theoretical model for estimating the maximum useful pump array size in longitudinally pumped rod and fiber lasers shows that this pump geometry is close to optimum

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Quantum Electronics, IEEE Journal of  (Volume:28 ,  Issue: 4 )