新型的全固态Ho:BaY2F8中红外激光器动力学及输出特性研究

项目名称： 新型的全固态Ho:BaY2F8中红外激光器动力学及输出特性研究

项目编号： No.61275146

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 柳强

作者单位： 清华大学

项目金额： 84万元

中文摘要： 新一代的红外制导武器大多采用了中波和长波红外探测器，避开了红外诱饵弹和干扰机的峰值发射波段，同时大气衰减和地面干扰也较弱，应用最为广泛。中波红外激光定向干扰则被认为是对抗这类红外焦平面阵列探测器制导武器的最有效手段，目前，产生中波红外固体激光的方法主要是光学参量振荡的方法，采用多级泵浦的方式，中波红外激光输出效率低、光束质量恶化、可靠性降低等缺点。本项目提出了基于Ho:BaY2F8晶体的全固态激光方法直接实现中红外输出。与传统激光晶体相比，Ho:BaY2F8晶体中波输出激光上能级寿命比激光下能级寿命短很多，此类晶体的全固态激光输出动力学特性研究还未见报道，研究针对该类激光器的动力学特性及有效泵浦方法意义重大。同时，针对全固态中波激光器量子亏损大，热效应严重等特点，本项目还提出了利用增益折射率导引和热致折射率导引效应控制该类量子亏损大激光输出模式新方法。

中文关键词： 中红外固体激光器；脉冲泵浦；直接泵浦；调Q技术；激光系统能级

英文摘要： The new generation of infrared guided weapons that mostly adopts the mid-infrared and far-infrared detectors, avoids the peak emission wavelength range of the infrared decoy projectile and the jammer, while the atmospheric attenuation and the ground molestation are weak as well, thus it has the most popular application. To countermeasure this very kind of infrared guided weapon with focal plane detector, laser directional jamming in the far-infrared domain is acknowledged as the most effective approach. Currently optical parametric oscillator with multiple pump stages is the main method to generate the mid-infrared solid-state laser, however suffering from low output efficiency, poor beam equality and degraded reliability. This project put forward an all-solid-state laser based on Ho:BaY2F8 crystal to directly produce the mid-infrared output. Compared with the traditional laser gain medium, Ho:BaY2F8 demonstrates an upper-level lifetime much shorter than the lower-level lifetime. Research on the dynamic characteristic of the all-solid-state laser based on Ho:BaY2F8, which has not been reported, as well as the efficient pump method are of great importance. In addition, to overcome the weak point of large quantum defect and serious thermal effect of all-solid-state mid-wavelength laser, this project presents a new

英文关键词： mid-infrared solid-state laser；pulsed pumping；direct pumping；Q-switched；system energy level