空间窄线宽激光器腔前耦合光学系统研制

Development of optical system for space-borne narrow line-width laser device

介绍了一种应用于空间锶光钟钟激光器腔前耦合光学系统的设计和研制。该系统是以我国"空间站高精度时频实验柜"工程应用为目标研制的小型化窄线宽激光器重要组成部分。该系统能够提供满足参考腔束腰半径要求的高斯光束,实现高斯光束和参考腔之间的模式匹配和稳定的激光功率耦合,实现基于电光相位调制边带锁频技术的鉴频误差信号探测。该系统所有光学组件均实现小型化设计,并集成在一块规格为162mm×130mm×68mm的铝合金光学基板上。使用有限元法分析了该光学基板在竖直和水平两个主振动方向上自由重力加载情况下的机械形变,最大形变量小于1μm。在实验室空间内,该系统经若干次搬运后,测量系统搬运前后输出鉴频信号的信噪比变化约为5%,无需介入人工调试仍可长期稳定工作,满足空间窄线宽激光器原理样机的应用需求。

The design and development of a cavity front coupling optical system for the laser device of space strontium light clock are introduced.The optical system is an important component of the compact narrow line-width laser device which is applied for“High Precision Time and Frequency Cabinet of Chinese Space Station”in China.The system can provide on-demand of Gauss beam to realize a good mode matching with the reference cavity,and detect the discriminator error signal for frequency locking based on electrooptic phase modulation technique.All optical components of the optic system have been miniaturized,and integrated on an Aluminum Alloy optical substrate with dimensions of162mm×130mm×68mm,using the finite element method to analyze the mechanical deformation of the optical substrate with the free gravity loading in two main vibration directions of vertical and horizontal have been analyzed,which turn out to be less than1μm.In laboratory environment,the mechanical stability of the system has been tested by measuring the changes of output discriminator error signal after several times transports.The results show that the variation is smaller than5%,and no need for manual adjustment.The system meets the application requirements for the space-borne narrow line-width principle prototype laser device.