本项目拟基于光纤激光技术和单频种子注入技术，解决OPO光源的小型化、单频和宽带调谐等问题，发展小型化光纤型单频宽调谐OPO中红外脉冲激光源。利用光纤激光器在近红外波段的丰富波长资源以及种子注入OPO非线性频率变换的特性，设计泵浦光和注入种子光调谐组合优化方案；通过研制相应的脉冲泵浦源和连续波种子源单频光纤激光器，提出周期极化晶体和谐振腔结构参数优化设计与调控方案，并解决注入种子光与腔频之间的高效耦合、OPO系统宽带调谐以及光纤传输偏振态的有效控制问题，构建高效单频宽带连续调谐的OPO中红外脉冲激光光源。通过本项研究，将为新型小型化便携式单频宽调谐脉冲中红外激光光源的发展奠定理论与技术基础，具有极其重要的科学意义和实用价值。

This research project plans to find new solutions to the miniaturization, narrow-bandwidth and wideband-tuning issues of OPO mid-infrared pulsed laser source based on fiber laser technology and injection-seeded technology. By utilizing the rich wavelength resources of near-infrared region fiber laser and the nonlinear frequency conversion characteristics of injection-seeded OPO, we can obtain the optimized design for the tuning ranges and combination project of pump light and injected seed light. By developing corresponding single-frequency fiber lasers of pulsed pump light and continuous-wave injected seed light, and optimizing the structure parameters and control of resonant cavity and periodically poled crystal, and realizing the efficient coupling between the injected seed light and cavity frequency, and solving the issues of OPO system broadband tuning and effective polarization state control, we build an efficient single-frequency widely tunable OPO mid-infrared pulse laser source. Obviously, executing this project plan will definitely establish a solid theoretical and technical foundation for the development of new miniaturized single frequency widely tuning of infrared pulsed laser source, and thus, holds an remarkable significance in both scientific research and technological progress.