Development of Frequency Stabilized Diode Laser Based on a Spectroscopic Study of Magnetically Induced Circular Dichroism of Atomic Rubidium

摘要

We developed a frequency-stabilized diode laser using magnetically induced circular dichroism. From a spectroscopic study of the Rb-D_2 line, the most stable Doppler-broadened and Doppler-free lines were found to be the transitions from the F_g = 2 ground state of ~(85)Rb and the crossover resonance from the F_g = 3 ground state to the F_e = 3 and 4 excited states of ~(85)Rb, respectively. Furthermore, we measured the fluctuation of a laser locked to the Doppler-free line to be ±50 kHz/8 h and thus revealed the applicability to a long-term frequency stabilization. The laser developed can be used as a reference laser in a frequency stabilization system for multiple tunable lasers for resonance ionization mass spectrometry (RIMS) analysis.