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High-inversion densities in Nd:YAG-upconversion and bleaching

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6 Author(s)
S. Guy ; Dept. de Phys. des Mater., Univ. Claude Bernard, Villeurbanne, France ; C. L. Bonner ; D. P. Shepherd ; D. C. Hanna
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We report on the investigation of upconversion in Nd:YAG and its implications for intensely pumped devices. Analysis of lifetime measurements and the performance of a 1 at.% Nd-doped YAG amplifier give an Auger upconversion rate of 7×103 s-1. This is significantly smaller than previously reported, but modeling of the performance of Nd:YAG devices with high-inversion densities shows that even this rate can still seriously degrade the small-signal gain and significantly increase the thermal load. The variation of cross-relaxation and upconversion rates with doping level is also described. Finally, it is found that the effect of bleaching of the Nd:YAG absorption can lead to a reduced spatial overlap between the signal and inversion profiles and thus can also significantly reduce the gain

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IEEE Journal of Quantum Electronics  (Volume:34 ,  Issue: 5 )