The 1.4–1.8 µm eye-safe lasers have been widely used in the fields of laser medicine and laser detection and ranging. The diamond Raman lasers are capable of delivering excellent characteristics, such as good beam quality concomitantly with high output power. The intra-cavity diamond Raman lasers have the advantages of compactness and low Raman thresholds compared to the external-cavity Raman lasers. However, to date, the intra-cavity diamond cascaded Raman lasers in the spectral region of the eye-safe laser have an output power of only a few hundred milliwatts. A 1485 nm Nd:YVO₄/diamond intra-cavity cascaded Raman laser is reported in this paper. The mode matching and stability of the cavity were optimally designed by a V-shaped folded cavity, which yielded an average output power of up to 2.2 W at a pulse repetition frequency of 50 kHz with a diode to second-Stokes conversion efficiency of 8.1%. Meanwhile, the pulse width of the second-Stokes laser was drastically reduced from 60 ns of the fundamental laser to 1.1 ns, which resulted in a high peak power of 40 kW. The device also exhibited single longitudinal mode with a narrow spectral width of < 0.02 nm.

提出了一种采用结构光照明的迈克尔逊非相干数字全息成像系统，该系统利用空间光调制器SLM实现水平和竖直方向的余弦光栅照明模式，以提高成像系统的横向分辨率。利用MATLAB软件进行仿真成像和数值重建，得到了该系统下的高分辨率重建像，从理论上证明了这一方法可以有效提高非相干数字全息系统的分辨率。搭建了相应的非相干光自干涉数字全息成像系统，通过对USAF1951分辨率板进行成像，从实验上进一步验证了基于结构光照明的超分辨成像方法对该成像系统的适用性。

菲涅耳非相干相关全息是一种能记录非相干物体全息图的新型技术，在生物医学成像和三维遥感领域具有重要应用前景。针对高光谱成像过程中图像融合配准困难的问题，文中利用空间光调制器的可编程特性，设计并制作了波长分别为492、562、672 nm的三组焦距恒定的双透镜相位掩模，依次调用三种波长的掩模并记录对应波长下物体的全息图。由于三色记录光经对应波长掩模调制后在CCD表面汇聚的光斑位置及尺寸均相同，因此，全息图重建后获得的重建图像具有相同的横向放大率，可提高图像融合时的配准精度，免去繁杂的光谱图像空间配准算法，真正实现了全息彩色成像的高精度配准和实时融合。采用该系统记录骰子的全息图，经数值重建及色彩融合后得到了颜色重建性较好的彩色三维像。