Float zone growth and spectroscopic properties of Yb:CaYAlO4 single crystal for ultra-short pulse lasers
Float zone growth and spectroscopic properties of Yb:CaYAlO4 single crystal for ultra-short pulse lasers
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DOI：
10.1016/j.optmat.2018.04.024
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发表时间：
2018-06
影响因子：
3.9
通讯作者：
M. Narita;M. Higuchi;T. Ogawa;S. Wada;A. Miura;K. Tadanaga
中科院分区：
文献类型：
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作者：
M. Narita;M. Higuchi;T. Ogawa;S. Wada;A. Miura;K. Tadanaga
采用浮区法生长了Yb：CaYAlO 4晶体，并对其光谱特性进行了研究。通过使用富Y成分的进料棒并借助于双区通技术，有效地抑制了空洞的形成。对于Yb的氧过量组成：Ca0.9925Y1.0075AlO4.00375，通过仅进行双区通获得无空隙晶体。另一方面，对于阳离子缺陷型Yb：Ca 0.9925Y1.005AlO4，通过执行双区通不能获得无空隙晶体。空洞的形成是由于Y和Ca的主要成分偏聚引起的成分过冷，在富Y区存在间隙过剩氧离子时可能存在同成分。σ-极化的吸收截面略大于π-极化的吸收截面，这与CaYAlO 4的晶体结构有关。
Yb:CaYAlO4single crystals were grown by the floating zone method and their spectral properties were investigated. Void formation was effectively suppressed by using a feed rod of Y-rich composition with the aid of a double zone-pass technique. For the oxygen excess composition of Yb:Ca0.9925Y1.0075AlO4.00375, a void-free crystal was obtained by performing only the double zone-pass. On the other hand, for cation-deficient type of Yb:Ca0.9925Y1.005AlO4, void-free crystal could not be obtained by performing the double zone-pass. The void formation is attributable to the constitutional supercooling caused by segregation of main constituents of Y and Ca, and the congruent composition may exist in the Y-rich region with existence of interstitial excess oxide ions. The absorption cross section for σ-polarization was slightly larger than that for π-polarization, which is reasonable on the basis of the crystal structure of CaYAlO4.