中文摘要：

介绍了一种基于Littrow结构的894nm外腔半导体激光器的设计原理，给出了光栅转轴的优化点计算，分析了无跳模范围和实际转轴位置的关系，指出了实际光栅转轴点的合理位置。针对铯原子激光抽运磁力仪的应用要求，通过外腔的选频功能，以及低噪声激光电流源、低温漂温控器和低噪声压电陶瓷驱动器，实现了自由运转波长为904nm的激光管调谐到894nm的单模运转，连续无跳模范围在3GHz以上。共焦FP腔的观测表明，外腔半导体激光器对自由运转激光管的线宽进行了有效压窄。搭建了饱和吸收谱装置，成功观测到了Cs原子D。线的F=3-〉F’=3，4和F=4-〉F’=3，4两套饱和吸收谱线。

英文摘要：

The design principle of 894 nm external cavity laser diode with Littrow configuration was introduced. The calculation on optimized grating mount pivot point position was given. Analysis of the mode-hop-free range versus practical pivot point position as well as the reasonable pivot point position were pointed. By frequency selection of external cavity and application of low noise current driver, low temperature drift controller and low noise piezo driver, single mode operation of the laser at 894 nm was realized on a laser diode with a free running,wavelength of 904 nm, which was to be applied in laser pumped Cesium magnetometer. The mode-hop-free range was above 3 GHz. It could be seen from the confocal FP cavity that the laser linewidth was effectively narrowed in the external cavity. In order to obtain Cs D1 spectrum, a saturation absorption spectroscopy layout was built and the hyperfine lines spectrum of F=3-〉F＇=3,4 and F=4-〉F＇=3,4 transition were successfully obtained.