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Wang Yue-wei, LU Fei-fei, HOU Xiao-kai, Wang Jun-min. The influence factors and optimization of modulation transfer spectroscopy for laser frequency discrimination with a cesium atomic vapor cell[J]. Chinese Optics. doi: 10.37188/CO.2023-0191
Citation: Wang Yue-wei, LU Fei-fei, HOU Xiao-kai, Wang Jun-min. The influence factors and optimization of modulation transfer spectroscopy for laser frequency discrimination with a cesium atomic vapor cell[J]. Chinese Optics. doi: 10.37188/CO.2023-0191

The influence factors and optimization of modulation transfer spectroscopy for laser frequency discrimination with a cesium atomic vapor cell

doi: 10.37188/CO.2023-0191
Funds:  Supported by The National Key R & D Program "State of Matter Regulation" is a key special project (No. 2021YFA1402002); National Natural Science Foundation of China (No.11974226)
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  • Corresponding author: wwjjmm@sxu.edu.cn
  • Received Date: 27 Oct 2023
  • Accepted Date: 26 Dec 2023
  • Available Online: 10 May 2024
  • Modulation transfer spectroscopy based on nonlinear near-degenerate four-wave mixing process can fundamentally eliminate the Doppler background of spectral lines, and has the advantages of high sensitivity and high resolution. Its dispersive linear pattern has good frequency detection characteristics.A weak probe light and a strong pump light modulated by frequency are transmitted in the atomic (molecular) chamber, and the frequency components of the modulated pump light include the center frequency of the pump light and the positive and negative first-order sidebands generated by modulation. Third-order nonlinear effects of atomic (molecular) samples can produce near-degenerate four-wave mixing, frequency modulation of the pump light can be transferred to the unmodulated probe light, and this modulation transfer only occurs when the sub-Doppler resonance conditions are met. In this experiment, we use an electro-optical potential phase modulator to modulate the pump light to obtain radio frequency modulation transfer spectroscopy (MTS), and study the optimization problem of the zero-crossing slope of the center of the dispersive signal of the MTS spectrum. By changing the modulation frequency of the pump light, the spot size of the pump light and the pump light, and the parameter dependence between the zero-crossing slope of the MTS spectral signal and the two, the optimal MTS spectral signal is obtained when the pump light modulation frequency is −3.6 MHz (about 0.69 times the natural linewidth). Finally, using the optimal MTS spectrum, the DL Pro @ 852 nm laser frequency is locked to the cesium atom D2 line (F = 4) - (F = 5') cycle transition, and the laser frequency fluctuation is about 170 kHz in the 60 minute sampling time, which is significantly improved compared with the frequency fluctuation of the laser −11 MHz during free running.

     

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