针对具有多波段强吸收和发光特点的N31和N41型掺钕磷酸盐激光玻璃，选取罗丹明6G(R6G)作为荧光标记物，它的激发和发光分别避开了钕离子吸收和发光，在宽场显微镜下实现了对磷酸盐玻璃亚表面缺陷(SSD)的高灵敏度二维观测。与光学显微观测的结果对比，证明所观测到的缺陷属于亚表面缺陷。根据R6G显微荧光观测的结果，分析了亚表面裂纹在抛光过程中的演变情况。结果表明在磷酸盐玻璃中比较难去除的亚表面缺陷是处于缺陷层中位置较深的Median型裂纹末端的月牙形缺陷。它们可能对入射光场具有较强的调制，引发表面激光损伤的可能性相对较大。

For N31 and N41 Nd-doped phosphate glasses with strong multiband absorption and emission, Rhodamine 6G (R6G) is chosen as the fluorescence label to realize high resolution two dimensional observation of subsurface defects (SSD) in these glasses under wide field microscopy, as the excitation and emission bands of R6G are different from the emission and excitation bands of Nd-doped phosphate laser glass respectively. It is demonstrated that the detected defects are classified as SSD by comparing the R6G fluorescence microscopy images and related optical microscopy images. The transformation of SSD during polishing process is analyzed according to related R6G fluorescence microscopy detection results. The results show that the crescent cracks which are near the tail end of deep Median type cracks are comparatively hard to be removed in the Nd-doped phosphate glass. These crescent cracks may induce strong modification to the incident optical field, and relatively increase the probability of laser induced surface damage.