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由于Rb蒸气的吸收峰随缓冲气体气压存在漂移,利用体布拉格光栅(VBG)实现线宽压窄的同时,实现泵浦半导体激光器中心波长的可调谐也是十分必要的。本文采用国内封装的半导体激光阵列(LDA),利用VBG的温度特性,实现了线宽不大于0.3nm的同时,激光器中心波长从779.89nm到780.35nm可调谐。该激光器可以通过叠阵方式用于Rb蒸气的泵浦和激励。
Since the absorption peak of Rb vapor shifts with the pressure of the buffer gas, it is necessary to achieve the narrowing of the line width by using the volumetric Bragg grating (VBG) and the tunability of the central wavelength of the pumped semiconductor laser. In this paper, a semiconductor laser array (LDA) packaged domestically was used. By using the temperature characteristics of VBG, the linewidth was not more than 0.3nm and the laser center wavelength was tunable from 779.89nm to 780.35nm. The lasers can be used to pump and pump Rb vapors in a stacked fashion.