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A spectroscopic analysis of nonlinear energy transfer in BaY 2 F 8 and LiYF 4 doped with Er 3+ is reported. We developed a new method to measure the upconversion parameter based on the sinusoidal modulation of the pump beam intensity and on the intensity spectrum analysis of the green fluorescence. We also present cw laser results in the 2μm wavelength region of...
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