本文采用激光加热基座法生长出一系列掺杂不同Er3+浓度(摩尔分数)的Er∶CaGdAlO4(Er∶CGA)激光晶体，并对制备出的系列晶体开展详细的光学性能研究。结合J-O理论计算和光学性能表征，通过对比吸收光谱中780~840和955~1 020 nm的最大吸收系数、吸收截面、半峰全宽和辐射寿命等，以及荧光发射光谱的发射强度、发射截面和能级荧光寿命等光学性能参数，得到Er3+的最佳掺杂浓度为5%。该工作为获得一种有望用于1.5~1.7 μm近红外波段全固态激光器的新型激光增益介质提供了一定的实验基础。

In this paper, a series of Er∶CaGdAlO4 (Er∶CGA) laser crystals with different Er3+ doping concentrations (molar fraction) were grown by laser-heated pedestal growth method. The optical properties of the prepared series crystals were studied in detail. The maximum absorption coefficient, absorption cross section, full width at half maximum and radiation lifetime at the range of 780~840 and 955~1 020 nm in the absorption spectra were compared by combining the J-O theoretical calculation and optical characterization. In addition, the optical performance parameters of fluorescence emission spectrum such as emission intensity, emission cross section and energy level fluorescence lifetime were characterized and futher calculated. As a result, the optimal doping concentration of Er3+ is 5%. This work provides a certain experimental basis for obtaining a new type of laser gain medium which is expected to be used in 1.5~1.7 μm near-infrared band all-solid-state laser.