脉冲宽度为皮秒的红光激光器，具有脉冲宽度窄，峰值功率高的优点，使其在工业、医疗、科研和信息存储等方面具有广泛的应用。本文采用声光锁模(AOML)的方式设计了一款具有窄线宽、高转换效率，输出波长为660 nm的全固态皮秒激光器。该激光器采用半导体侧面泵浦的方式，通过优化谐振腔型，并使用两块LiB₃O₅ ( LBO )晶体进行腔外倍频，最终获得最大输出功率为8.6 W的660 nm激光输出。激光器采用脉冲侧面泵浦的模式，获得的锁模脉冲频率为100 MHz，脉冲宽度为887 ps。1319 nm至660 nm激光的倍频转换效率可达41%。

通过分析成像原理、仿真光学模型和搭建原理样机，讨论了在实验环境下影响自准直定标系统定标精度的主要因素，提出了定标系统在设计和工作中应注意的主要问题，包括像元尺寸选取、像点位置算法、调焦量计算和系统装调误差。根据分析结果对原理样机的定标误差进行了校正，最终实现原理样机的焦距定标精度小于0.4 mm，X、Y和Z方向旋转的定标精度分别小于0.6″、0.6″和12″，定标精度的相对误差优于0.2%。

Li ions affect the upconversion efficiency by changing the local crystal field of the luminescent center. Herein, in order to improve the upconversion efficiency of NaYF₄:Yb³⁺/Eu³⁺, a series of NaYF₄:Yb³⁺/Eu³⁺ micro-particles with different Li⁺ doping concentrations were synthesized by the hydrothermal synthesis method, respectively. Firstly, the structure and morphology of NaYF₄:Yb³⁺/Eu³⁺ upconversion micro-particles (UCMPs) with different doping concentrations were analyzed by X-ray diffraction and a scanning electron microscope (SEM). SEM results show that the UCMPs are not only highly crystallized, but also have hexagons with different Li⁺ concentrations of NaYF₄:Yb³⁺/Eu³⁺. X-ray diffraction shows that the crystal field around Eu³⁺ changes with the increase of Li⁺ concentration. Then, the fluorescence spectrum of NaYF₄:Yb³⁺/Eu³⁺ was studied under the irradiation of a 980 nm laser. The results show that the fluorescence intensity of NaYF₄:Yb³⁺/Eu³⁺ with 2% Li⁺ is the strongest, which is twice the intensity of NaYF₄:Yb³⁺/Eu³⁺ without Li⁺. Finally, the fluorescence imaging analysis of NaYF₄:Yb³⁺/Eu³⁺ with 2% Li⁺ concentration was carried out. The UCMPs are used to screen printing to evaluate the imaging effect on different sample surfaces. The results show NaYF₄:Yb³⁺/Eu³⁺ (with 2% Li⁺) has great application prospects in anti-counterfeiting recognition.

提出了一种实时反馈控制系统，保证波长调制干涉仪的激光光强在波长调谐过程中的稳定性，以减小波长调制干涉仪因激光光强的波动产生的相位误差。该控制系统由光电探测器、数据采集卡、光电调幅器和控制软件等组成。实验结果表明，该系统的响应速度超过了干涉仪获取干涉图的速度，不仅能够稳定输出理想的光强值，而且还提高了干涉仪的测量精度。