Influence of laser heating temperature characteristics on SERF atomic magnetometer

Area of Science:

• Atomic physics
• Quantum sensing
• Magnetometry

Background:

• The SERF (Spin-Exchange Relaxation Free) atomic magnetometer operates optimally in high-temperature, zero-magnetic-field conditions.
• Laser heating is a preferred method for atomic cells due to its magnetic cleanliness and stability.
• Improving temperature uniformity within the atomic cell is crucial for enhancing magnetometer sensitivity.

Purpose of the Study:

• To introduce and evaluate an orthogonal laser heating configuration for atomic cells.
• To investigate the impact of temperature uniformity on atomic magnetometer sensitivity.
• To provide a theoretical model linking temperature variations to sensitivity.

Main Methods:

• Utilizing an orthogonal laser heating configuration for atomic cells.
• Employing finite element method (FEM) simulations to analyze temperature distributions.
• Conducting experimental measurements with a single-beam atomic magnetometer.
• Simulating the spatial distribution of the conversion coefficient within the atomic cell.

Main Results:

• The orthogonal heating configuration significantly improves temperature uniformity in the atomic cell compared to coaxial heating.
• Simulations indicate an 11.3% improvement in magnetic field sensitivity with the orthogonal configuration.
• Experimental results show a 14.3% enhancement in magnetic field sensitivity (48 fT/√Hz vs. 56 fT/√Hz).

Conclusions:

• Orthogonal laser heating effectively enhances temperature uniformity within atomic cells.
• This improved uniformity directly leads to a significant increase in atomic magnetometer magnetic field sensitivity.
• The study validates the benefits of orthogonal laser heating for high-performance atomic magnetometers.