Abstract One of the convenient methods to obtain green laser is by self-frequency-doubling (SFD) technique, the key is the SFD laser crystal. In this article, a bulk single crystal of 3.34 at.% Nd:CaSrNb2O7 was successfully grown by Czochralski method at about 1481 °C. Its spectral and thermal properties were investigated. There is a broad and strong absorption band at around 804 nm, which is very suitable for AlGaAs laser diode pumping. The polarized emission spectra show large emission cross-sections and full width at half maximum at around 1068 nm, and the fluorescence lifetime is 202 μs? Moreover, the fluorescence quantum efficiency reaches to 98.6%. The long lifetime, large emission cross-section, and high fluorescence quantum efficiency of Nd:CaSrNb2O7 crystal indicate that it is easy to achieve laser oscillation. The second harmonic generation intensity of 3.34 at.% Nd:CaSrNb2O7 crystal is about 3 times that of KH2PO4, and phase matching can be realized in this crystal. All these results show that Nd:CaSrNb2O7 is a good bifunctional crystal, which possesses laser and nonlinear optical functions simultaneously, and also demonstrate that it is a promising SFD material.

中文翻译：

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双功能 Nd:CaSrNb2O7 晶体：一种潜在的自倍频激光材料候选者

摘要 自倍​​频（SFD）技术是获得绿色激光的简便方法之一，其关键是SFD激光晶体。在本文中，3.34 at.% Nd:CaSrNb2O7 的块状单晶通过直拉法在约 1481 °C 下成功生长。对其光谱和热性能进行了研究。在804nm附近有宽而强的吸收带，非常适合AlGaAs激光二极管泵浦。偏振发射光谱在 1068 nm 附近显示出较大的发射截面和半峰全宽，荧光寿命为 202 μs? 此外，荧光量子效率达到98.6%。Nd:CaSrNb2O7 晶体的长寿命、大发射截面和高荧光量子效率表明很容易实现激光振荡。3.34 at.% Nd:CaSrNb2O7 晶体的二次谐波产生强度约为 KH2PO4 的 3 倍，在该晶体中可以实现相位匹配。所有这些结果表明，Nd:CaSrNb2O7 是一种良好的双功能晶体，同时具有激光和非线性光学功能，也表明它是一种很有前途的 SFD 材料。