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Continuous‐wave, fourfold upconversion laser
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12.In our earlier publications, unsaturated emission intensity was shown to depend on the cube, not the fourth power, of incident intensity, thereby contradicting a sequential energy transfer model for visible upconversion with in erbium requiring four transfers. Sequential pair processes and sequential multiphoton absorption processes are ruled out not only by our previous work on time dependence of upconversion fluorescence, but also by the excitation spectra which are not convolutions of ground and excited state resonances.
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