Optimization in scaling fiber-coupled laser-diode end-pumped lasers to higher power: influence of thermal effect
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1997
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Abstract
The optimum mode-to-pump ratio in scaling fiber-coupled laser-diode end-pumped lasers to higher power has been investigated by including the thermal effect into the space-dependent rate equation analysis. The optical path difference (OPD) distribution has been derived as a function of the pump-beam quality, focus position of pumping light, and pump radius at the focal plane under the assumption that the end faces of the crystal are thermally insulated. The diffraction losses arising from thermally induced spherical aberration have been estimated by the Strehl intensity ratio. The present results for the optimum mode-to-pump ratio are markedly different from previous analyses in which thermal effects are neglected. Here, the optimum mode-to-pump ratio is a decreasing function of input pump power, and is less than unity in the case of a slightly high pump power. The practical example of a Nd:YAG laser pumped by a 13-W fiber-coupled laser diode is considered to confirm our physical analysis.
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wang1997ieeeoptimization
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| Authors | Y.F. Chen,T.M. Huang,C.F. Kao,C.L. Wang,S.C. Wang;Y.F. Chen;T.M. Huang;C.F. Kao;C.L. Wang;S.C. Wang; |
| Journal | ieee journal of quantum electronics |
| Year | 1997 |
| DOI |
10.1109/3.605566
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