研究目的
Investigating the generation and maintenance of atomic coherence through linear and nonlinear spin-exchange coupling in a Bell-Bloom magnetometer, outside the standard conditions for collisional coherence transfer.
研究成果
The study demonstrates that linear and nonlinear spin-exchange coupling can lead to the generation of atomic coherence in a Bell-Bloom magnetometer, even outside the standard conditions for collisional coherence transfer. The nonlinear spin-exchange coupling acts analogously to a wave-mixing mechanism, creating additional modes of coherent excitation that inherit the magnetic properties of the natural Larmor coherence. This effect, combined with a controlled modulation, provides a rich scenario for improving spin coherence and paves the way for new schemes in room-temperature vapor magnetometry.
研究不足
The study is conducted in a low-density caesium vapor and for nonzero magnetic field, outside the standard conditions for collisional coherence transfer. The nonlinear coupling effect is observed only for relatively strong pump power.
1：Experimental Design and Method Selection:
The study involves a Bell-Bloom pumping process to generate atomic coherences within ground-state manifolds of Cs atoms in a low-density thermal vapor. The pump is modulated at a frequency whose integer multiples do not overlap with the Larmor frequency.
2：Sample Selection and Data Sources:
Measurements are performed on a low-density (
3：33×1011 cm?3) thermal vapor of Cs atoms in an antirelaxation, paraf?n coated, glass cell. List of Experimental Equipment and Materials:
The setup includes a circularly polarized pump laser beam, a probe beam for Faraday-type polarization rotation measurements, and a balanced photodetector for signal analysis.
4：Experimental Procedures and Operational Workflow:
The pump power is modulated with a square pulsed waveform, and the atomic coherences are monitored by continuous Faraday-type polarization rotation measurements. The signal is analyzed to extract its Fourier transform.
5：Data Analysis Methods:
The Fourier transform of the magneto-optical signal is analyzed to monitor spectral components oscillating at frequencies other than the modulation frequency.
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