The magnetically modulated saturation absorption proﬁle is studied for a wide range of external DC magnetic ﬁeld. The salient features of Doppler-free signal generated by laser frequency modulation and atomic energy level modulation are compared. The DC offset of the signal proﬁle is found to be unstable as the external DC magnetic ﬁeld is changed. The technical difﬁculty of tuning laser frequency under locked condition over a large frequency span is discussed along with possible solutions.
Volume 96, 2022
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