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镁掺量对镁钕铌酸锂晶体的抗光损伤和激光性能的影响

DOI: 10.7521/j.issn.0454-5648.2014.08.019

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Abstract:

采用提拉法生长了掺0.4%(摩尔分数,下同)Nd2O3和分别掺1.0%、3.0%、5.0%、7.0%MgO的4种Nd∶Mg∶LiNbO3(Nd∶Mg∶LN)晶体。通过透射光束变形法测试晶体抗光损伤能力。结果表明0.4%Nd∶7.0%Mg∶LN和0.4%Nd∶5.0%Mg∶LN两种晶体抗光损伤能力皆达到阈值浓度,抗光损伤能力比0.4%Nd∶3.0%Mg∶LN和0.4%Nd∶1.0%Mg∶LN晶体提高2个数量级。利用980nm激光二极管测试晶体的荧光光谱。在500~900nm的光谱范围内,出现2个光发射带,发光强度最强的近红外发射波长为840nm,对应4I9/2→2H9/2,4F5/2能级跃迁。840nm处荧光来源于双光子过程,该上转换荧光在生物医学领域有着应用前景。

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