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通过探测在连续调谐抽运光作用下的气室对频率确定的探测光的吸收,可获得光抽运光谱,探测光和抽运光同时耦合不同的超精细跃迁时可形成光抽运光谱的峰值,此时两个光场有确定的稳定性依赖于原子能级的频率差。利用光抽运光谱并结合锁频环路,完成了参考频率为原子超精细分裂的连续半导体激光器间的偏频锁定。通过选择不同的超精细能级,两个激光器输出激光的频率偏移可以锁定在数百兆赫兹的激发态超精细能级间隔或约9 GHz的基态能级间隔附近。
The optical pumping spectrum is obtained by detecting the absorption of the probe light of a certain frequency determined by the gas chamber under continuous tuned pumping light. The optical pumping spectrum can be obtained when the probe light and the pumping light are simultaneously coupled to different hyperfine transitions Peak. At this point, the two light fields have a definite stability that depends on the frequency difference of the atomic level. By using optical pumping spectroscopy combined with frequency locked loop, the frequency offset locking between continuous semiconductor lasers with reference frequency superfine atomization is completed. By choosing different hyperfine levels, the frequency offsets of the two laser output lasers can be locked at hundreds of megahertz of excited-state hyperfine levels or around 9 GHz of ground-level levels.